Save authentication contact on android

How do I make the software ask to save email and password in Android passwords after logging in???

Once you log in, it remains active until you sign out. Call SignOut
so it only checks at the beginning, otherwise it loads the email from the DB.

It is not good practice to store passwords

Also never store passwords in plain text in an online database…
your users want you to keep their data safe…
store password hashes instead of plain text

To store password hashes is very simple, the tools extension offers a method for that App Inventor Extensions: Tools | Pura Vida Apps

And later if you want to check, if the entered password is correct, compare the password hashes

Taifun