Se clicares duas vezes no ícone, o documento abre.

Because after se when Portuguese is talking about a real future possibility, it normally uses the future subjunctive.

So:

• se clicares = if you click
• not se clicas in this kind of sentence

This is very common in Portuguese:

• Se tiveres tempo, telefona. = If you have time, call.
• Se chover, ficamos em casa. = If it rains, we stay home.

For English speakers, this can feel unusual because English uses the present tense after if, but Portuguese often uses the future subjunctive in these cases.

Clicares is the future subjunctive of clicar, for tu.

Here is that tense for clicar:

• eu: clicar
• tu: clicares
• ele/ela/você: clicar
• nós: clicarmos
• vós: clicardes
• eles/elas/vocês: clicarem

So se clicares means if you click, specifically when speaking to tu.

Yes. Clicares shows that the sentence is speaking to tu.

The full sentence could be expanded as:

• Se tu clicares duas vezes no ícone, o documento abre.

Portuguese often leaves subject pronouns out because the verb ending already shows who the subject is.

If the sentence were addressing você, it would be:

• Se clicar duas vezes no ícone, o documento abre.

So this sentence is clearly in the tu form, which is very common in Portugal.

Abre is the present indicative of abrir, and Portuguese often uses the present tense to describe something that happens automatically or generally as a result.

So:

• Se clicares duas vezes no ícone, o documento abre.

means something like:

• If you double-click the icon, the document opens / will open.

Using abrirá is also possible, but it sounds more formal or more explicitly future-oriented:

• Se clicares duas vezes no ícone, o documento abrirá.

In instructions, manuals, and interface language, the present tense is very natural.

O documento abre is a straightforward, natural way to say that the document opens.

It presents o documento as the subject:

• o documento = the document
• abre = opens

You may also see other patterns in Portuguese, such as impersonal or passive-style wording, but here the sentence is simple and direct: the document opens.

For a learner, it is best to read it as:

• o documento = subject
• abre = verb

Duas vezes literally means two times, and in this context it means twice.

So:

• clicares duas vezes = click twice
• more naturally in English: double-click

Portuguese often expresses this as duas vezes rather than using a single verb equivalent to double-click, although you may also hear:

• fazer duplo clique
• dar dois cliques

All of these are possible depending on context and style.

Because no is the contraction of:

• em + o = no

So:

• no ícone = in/on the icon

This kind of contraction is very common in Portuguese:

• em + a = na
• em + os = nos
• em + as = nas

So clicar no ícone is the normal form, not clicar em o ícone.

In Portuguese, clicar is commonly followed by em when you say what you are clicking on:

• clicar no ícone
• clicar no botão
• clicar na ligação

English says click the icon or click on the icon, but Portuguese usually prefers the structure with em:

• clicar em + o ícone → clicar no ícone

So this is a normal verb + preposition pattern that needs to be learned as a unit.

Yes, ícone is masculine here, which is why the sentence has:

• o ícone
• no ícone

Many nouns ending in -e can be either masculine or feminine, so the article is important.

In this sentence, the article tells you clearly that it is masculine:

• o ícone

The sentence has two parts:

1. Se clicares duas vezes no ícone
2. o documento abre

So the structure is:

• Se + verb
• then the result clause

And inside the second clause:

• o documento = subject
• abre = verb

A useful way to see it is:

• If you click twice on the icon, the document opens.

The word order is quite normal and neutral.

Grammatically, yes, but it is much less natural in everyday modern Portuguese, especially in ordinary software instructions.

• o documento abre sounds simple and natural
• o documento abrirá sounds more formal
• o documento abrir-se-á sounds even more formal and somewhat stiff in this context

For interface language, o documento abre is the most natural of those options.

It can be understood as a general result or an instructional cause-and-effect statement.

In other words:

• whenever you do this, that happens

That is why the present tense abre works well. It does not only mean something happening right now. It can also express a regular consequence:

• Se carregares aqui, a página abre.
• Se ligares o computador, o programa arranca.

So the sentence is not just about one future event. It is describing what happens under that condition.

A few natural alternatives are:

• Se clicares duas vezes no ícone, o documento abre.
• Se fizeres duplo clique no ícone, o documento abre.
• Ao clicares duas vezes no ícone, o documento abre.

The original sentence is already natural. A manual or interface might also use a more impersonal style, but the given version is clear and idiomatic.

In European Portuguese, clicares is roughly pronounced with the stress on ca:

• cli-CA-res

A few useful pronunciation points:

• cl is pronounced clearly, as in English click
• the a in the stressed syllable is open and clear
• the final -res in European Portuguese is often less fully pronounced than an English speaker might expect, especially in fast speech

And ícone has the stress on the first syllable:

• Í-co-ne

So:

• Se clicares duas vezes no ícone...

has the main stresses on ca, ve, and í.

Yes, that is a very close literal translation.

But the most natural English translation is usually:

• If you double-click the icon, the document opens.

So for understanding the Portuguese structure, the literal version is useful:

• clicares duas vezes = click two times / click twice

But for natural English, double-click is better.