Ég smelli á hlekkinn í tölvupóstinum.

Smelli is the 1st person singular present tense form of the verb smella.

• að smella = to click
• ég smelli = I click
• þú smellir = you click
• hann/hún/það smellir = he/she/it clicks

So in this sentence, Ég smelli means I click.

The verb is commonly used as smella á e-ð, meaning to click on something.

So:

• smella á hlekkinn = click on the link

This is just the normal Icelandic pattern for this meaning. English says click on, and Icelandic often says smella á.

Hlekkinn is the accusative singular definite form of hlekkur.

Here is the noun:

• hlekkur = link
• hlekkinn = the link

It appears in this form because á in smella á hlekkinn takes the accusative here.

So:

• hlekkur = a link / the link as dictionary form
• hlekkinn = the link as the object after smella á

The dictionary form is hlekkur, which is a masculine noun meaning link.

A learner may not immediately recognize hlekkinn because Icelandic nouns change form depending on case and whether they are definite.

A simplified breakdown:

• hlekkur = link
• hlekk = link, in some oblique forms
• hlekkinn = the link

So if you look up hlekkinn, you should search for hlekkur.

Because í can take two different cases:

• accusative when it means into
• dative when it means in / inside / within

Here, the meaning is in the email, not into the email, so Icelandic uses the dative:

• í tölvupóstinum = in the email

So the sentence is describing where the link is located.

Tölvupóstinum is the dative singular definite form of tölvupóstur.

• tölvupóstur = email
• tölvupóstinum = in the email / the email, in dative form

The ending -inum is a very common masculine dative singular definite ending in Icelandic.

Icelandic usually expresses the with a suffix attached to the noun, rather than with a separate word like English.

So:

• hlekkur = a link
• hlekkurinn / hlekkinn = the link
• tölvupóstur = an email
• tölvupósturinn / tölvupóstinum = the email

In this sentence, both things are specific:

• the link
• the email

That is why both nouns are definite.

Yes, but the meaning becomes more general or less specific.

For example:

• Ég smelli á hlekk í tölvupósti. = I click on a link in an email.

That sounds less like a specific known link and email, and more like a general situation.

The original sentence with hlekkinn and tölvupóstinum points to specific things.

That is the most natural neutral word order here.

The sentence is structured like this:

• Ég = subject
• smelli = verb
• á hlekkinn = object/prepositional phrase
• í tölvupóstinum = additional phrase telling you where the link is

So the basic idea is:

• I click on the link
• which is in the email

Icelandic word order can change for emphasis, but this version is the most straightforward.

Yes, but usually for emphasis or style.

For example:

• Í tölvupóstinum smelli ég á hlekkinn.

This puts focus on í tölvupóstinum = in the email.

However, Icelandic is not completely free in word order. The verb still usually follows the first element in main clauses, because Icelandic is a V2 language. So learners should first get comfortable with the neutral version:

• Ég smelli á hlekkinn í tölvupóstinum.

Yes, smella á is a very normal and natural way to say click on something, especially in computer and internet contexts.

So sentences like these are common:

• Smelltu á hnappinn. = Click the button.
• Smelltu á hlekkinn. = Click the link.

You may also hear other expressions in informal speech, but smella á is a very standard choice.

Ég means I.

The accent mark shows that the vowel is pronounced differently from plain e. In Icelandic, accent marks are not optional spelling marks; they are part of the word.

So:

• Ég is the correct spelling
• you should not write Eg in normal Icelandic

This is true for many Icelandic words: the accented vowel is considered a separate letter/sound, not just decoration.

Yes. Icelandic very often builds words by combining smaller words.

Tölvupóstur is made from:

• tölva = computer
• póstur = mail/post

So tölvupóstur literally means something like computer mail, i.e. email.

This kind of compound word formation is extremely common in Icelandic.