How can you log out of e-mail?

I just got my sister's laptop and her email account is still registered.

Does anyone know how I can put my email there?

Which email program then?

Gmail?

It depends on which app or application you mean. Unfortunately, you didn't tell us.

So my sister's was gmx and mine is iCloud, and it's on an apple laptop (which is very old, from 2009)

No, yours was gmx and mine is iCloud

So my sister's was gmx and mine is iCloud, and it's on an apple laptop (which is very old, from 2009)

Then just delete gmx if you don't need it.

How to delete This is e-mail on this app… No idea how I can delete it haha

But where was she logged in? Online at https://www.gmx.net/?

I was talking about the app, not your email service provider.

Enter the wrong PIN several times and it will be blocked.

Oh, that's what I meant, which email program, not which provider.