Tienes que hacer clic en el enlace para iniciar sesión.

Tener que + infinitive is one of the most common ways in Spanish to say have to / need to.

So:

• Tienes que hacer clic = You have to click
• Debes hacer clic = You must / should click
• Necesitas hacer clic = You need to click

All three are possible, but they are not identical:

• tener que is the most neutral and everyday option
• deber can sound a bit more formal, or sometimes like advice
• necesitar focuses more on necessity than obligation

In instructions on websites, tienes que is very natural.

Tienes is the tú form of tener, so the sentence is addressing one person informally:

• tú tienes que... = you have to...

Spanish often leaves out the subject pronoun tú, because the verb ending already shows who the subject is.

So:

• Tú tienes que hacer clic...
• Tienes que hacer clic...

both mean the same thing, but the second is more natural in most cases.

If the sentence were formal, it would be:

• Tiene que hacer clic... = You have to click... (formal usted)

In Spanish, clic is normally used as a noun, so Spanish uses the verb hacer with it:

• hacer clic = to click

This is very common with computer language. Literally it is like to make a click.

Examples:

• Haz clic aquí. = Click here.
• Tienes que hacer clic en el botón. = You have to click the button.

You may also sometimes see clicar, but in standard Spain Spanish, hacer clic is generally the safest and most widely accepted choice.

Spanish normally uses hacer clic en something:

• hacer clic en el enlace
• hacer clic en el botón
• hacer clic en la imagen

So en is required with this expression.

This is different from English, where we usually just say click the link. Spanish prefers the structure:

• click on the link → hacer clic en el enlace

Even though English often drops on, Spanish usually keeps en here.

Enlace is the standard Spanish word for link, especially in websites and digital contexts.

So:

• el enlace = the link

In everyday tech Spanish, some speakers may also use link, especially in informal contexts, but enlace is the more standard Spanish word and is very common in Spain.

You might see:

• Haz clic en el enlace
• Pincha en el enlace

Both are normal in Spain, though enlace itself is standard vocabulary.

Para + infinitive means in order to / to when expressing purpose.

So:

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

The sentence structure is:

• Tienes que hacer clic en el enlace = the action you must do
• para iniciar sesión = the purpose of that action

So literally:

• You have to click on the link in order to log in

This is a very common structure in Spanish:

• Estudio para aprender. = I study to learn.
• Abre la app para continuar. = Open the app to continue.

Iniciar sesión is the standard expression for to log in / to sign in.

Literally, it means something like to start a session.

Other verbs are possible in some contexts, but they are not exactly the same:

• iniciar sesión = to log in / sign in
• entrar = to enter / go in
• acceder = to access

For websites and accounts, iniciar sesión is the most precise expression.

Related phrases:

• cerrar sesión = to log out
• inicio de sesión = login / sign-in as a noun

Yes, sesión is feminine:

• la sesión

But in iniciar sesión, there is no article because this is a fixed verbal expression, similar to saying to log in rather than to start the session.

Compare:

• Necesito iniciar sesión. = I need to log in.
• La sesión ha caducado. = The session has expired.

So when you are talking about the action, Spanish often uses iniciar sesión with no article.

Yes, especially in Spain, pinchar en can also mean to click on:

• Tienes que pinchar en el enlace...

This is common in spoken Spanish in Spain, especially in informal tech instructions.

However:

• hacer clic is more neutral and widely understood
• pinchar is more regional in feel and can have other meanings too

So for learners, hacer clic en is usually the best expression to learn first.

A simple pronunciation guide:

• clic ≈ kleek
• enlace ≈ en-LA-theh in much of Spain
  or en-LA-seh in Latin America

For Spain specifically:

• clic has a short, clear i
• enlace has stress on the middle syllable: en-LA-ce
• in most of Spain, the c before e sounds like the th in thin

So in Spain Spanish:

• clic en el enlace ≈ kleek en el en-LA-theh

This is the normal and most natural order for a neutral instruction:

• Tienes que hacer clic en el enlace para iniciar sesión.

Spanish word order is fairly flexible, but not all variations sound equally natural.

For example, these are possible:

• Para iniciar sesión, tienes que hacer clic en el enlace.
• Tienes que hacer clic para iniciar sesión en el enlace. → this sounds less clear or awkward, because it can momentarily suggest that iniciar sesión happens in the link

So the original order is good because it keeps the meaning clear:

1. action: hacer clic en el enlace
2. purpose: para iniciar sesión

Yes. If you want to give a direct instruction, you would often use the imperative:

• Haz clic en el enlace. = Click the link.

That is the tú command form of hacer.

Other possibilities:

• Haga clic en el enlace. = formal usted
• Haced clic en el enlace. = informal plural in Spain (vosotros)
• Hagan clic en el enlace. = formal plural / Latin American plural

So the sentence in your example is a statement of necessity, while Haz clic... is a direct command.