First share your apple account also real password and id , it's not real issue because anyway developer can't chnage account password if he not have access also email , but you also have option to share in 3 simple step.
- First Click on User and Rules
- Click on (+) Button to add user
- Add your new user name + email
Google you must share your account with your developer because the account connected your gmail , and process very simple too
Google Play Process
- 1 - Clicks Settings , 2 - User Accounts & Rights , 3 - Invite User
- Choose share "Release Manager" Option with your developer