How to make my Facebook iphone 5s app to remember my email when I log out?

I want to be able to log out of the app but when I want to log back in I want my email to be saved already so I can just type my password.

It is default feature of this type of standard app.
You just manage it as you like.
When you log-out, and again login then it will show your last login id or saved id.
Hope you will understand…

He can't understand because you didn't answer the question. Obviously before he just write he's password to log in on Facebook, but now he need to write the email too every time he wants to log in. So he's asking how he could make the app remember the email so he could log in to Facebook writing only the password as he does before.

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