Here are the steps to give admin access to your Google Developer account:
Login to your Google Developer account with your Google ID and password
- Click on Settings
- Click on Users & Permissions
- Click on Invite New User
- Add Email Id 'firstname.lastname@example.org' and select Never for expiry date
- Select all boxes for 'Access Level', 'Release Management', 'Store Presence'
- Click on Send Invitation.
Hope this article was useful :)