You sign up with, and manage, your Google Account from http://MyAccount.Google.Com/
We can not help you with changes to that account, or forgotten passwords.
We obtain basic information, like your name, your public portrait (if you've set one), and e-mail address from Google. We do not share this information with anyone.
You must be 13 years old to sign up for a Google account. If you're under 13, your parent or guardian can create a game play account for you. Then, you can sign in with a Child Account