To be able to play with your email and password, you have to go to "login data" and tap on "separate game from Google/Facebook".
You will be asked if you want to convert your account into a mobile account.
Press OK, and enter the desired email and password.
You will be asked if you want to convert your account into a mobile account.
Press OK, and enter the desired email and password.
Once you have entered your new login data, tap on send registration. An activation email will be sent to the entered email so that you can play on multiple devices.