Pulsa el botón para iniciar sesión.

Here, pulsa means press.

In device or interface instructions in Spain, pulsa is very common for:

• pressing a physical button
• tapping a screen button
• sometimes even clicking an on-screen button

So Pulsa el botón... is a very natural instruction in Spanish (Spain).

Pulsa is the tú imperative form of the verb pulsar.

So:

• pulsar = to press
• pulsa = press! / press it!

This is the form used when giving a direct instruction to one person in an informal way.

Examples:

• Pulsa aquí. = Press here.
• Abre la puerta. = Open the door.

In Spanish, subject pronouns are often omitted because the verb form already shows who the instruction is aimed at.

So:

• Pulsa el botón = Press the button
• Tú pulsa el botón is possible, but normally unnecessary

In commands, leaving out the pronoun is the standard, natural choice.

El botón means the button, and Spanish often uses the definite article when the thing is specific or obvious from the context.

In an interface, there is usually a particular button the user is expected to see and press, so el botón sounds natural.

Compare:

• Pulsa el botón verde. = Press the green button.
• Pulsa un botón. = Press a button.
  This sounds vague, as if any button would do.

This is para + infinitive, which is a very common structure meaning in order to... or to...

So:

• para = for / in order to
• iniciar sesión = log in

Together:

• para iniciar sesión = to log in / in order to log in

This structure expresses purpose.

Other examples:

• Estudio para aprender. = I study to learn.
• Pulsa aquí para continuar. = Press here to continue.

Yes. Iniciar sesión is a standard expression meaning to log in.

Literally, it is something like to start a session, but in everyday computing language it simply means to sign in / log in.

Very common related expressions are:

• iniciar sesión = to log in
• cerrar sesión = to log out

This is one of those phrases that is best learned as a whole chunk.

Sometimes, but not always.

Entrar means to enter/go in, and in some contexts people may understand it as logging in, especially in casual speech. But in interface language, iniciar sesión is much more precise and standard.

So on websites and apps, you will usually see:

• Iniciar sesión

rather than:

• Entrar

Because iniciar sesión clearly means log in, not just enter.

It is especially common and natural in Spain, yes.

In other varieties of Spanish, you may also hear:

• presiona
• oprime
• haz clic en

But in Spain, pulsa is very common in instructions involving buttons and screens.

So if you are learning Spanish from Spain, this is a very useful word to know.

All three can relate to pressing, but they are not used in exactly the same way.

• pulsa: very common in technical instructions, buttons, interfaces
• presiona: also means press; neutral and common in many places
• aprieta: often feels more physical, like squeezing or pressing tightly

For a device or app instruction in Spain, pulsa is usually the most natural choice.

Yes.

If you want the formal usted command, you use:

• Pulse el botón para iniciar sesión.

So:

• pulsa = informal singular (tú)
• pulse = formal singular (usted)

Many public signs, manuals, and customer-facing interfaces may prefer the formal version.

Sesión is pronounced roughly like seh-SYON.

The accent mark tells you the stress falls on the last syllable:

• se-sión

It needs the written accent because words ending in n, s, or a vowel normally have stress on the second-to-last syllable unless an accent mark shows otherwise.

So without the accent, the stress would be wrong.

Yes.

Even though botón literally means button, in modern Spanish it can refer both to:

• a physical button
• an on-screen button in an app or website

And pulsa can work for both in many contexts, especially in Spain.

So this sentence is perfectly natural in digital instructions.

A simple pronunciation guide is:

POOL-sa el bo-TON PA-ra ee-nee-thyar seh-SYON

Notes for Spain Spanish:

• pulsa: stress on PUL
• botón: stress on the second syllable
• iniciar in much of Spain has the ci pronounced like thy
• sesión: stress on the last syllable

If you use Latin American pronunciation instead, iniciar would sound more like ee-nee-SYAR, which is also correct in its own variety.