Final works for upload to google play

Hi Folks,

that´s the first time of uploading a game on google Play.
First I put my first project as an alpha version, there.
But I must do some changes within the AndroidManifest.xml
I use Android Studio for it. But I cannot change anything, because
there is just a read-only-permission. Somebody who can tell me
to change this? And after doing the changes, what is left to be

Oh yes... my game has a size of 104 MB... I need an extension
on google Play. Anybody who can tell me, how to do that?
Gratefully! And stay healthy... you and your loves!