To add an Administrator to your account, go to Account - Users and click "Edit" next to the name of the user you want to add as an Administrator. Scroll to the bottom of the user page and check the "Account Administrator" option and select "Save changes".
Create, edit, and delete teams
Create, edit, and delete users
Activate and deactivate users across all teams
Edit account billing information
Access team settings for any team
View any team, even if they are not a member
Designate other account Administrators
Remove themselves as account administrators
For access to manage team level settings but not account and billing, use the Team Manager option.