Account Owners and Admins can upgrade a Full User to an Admin directly from the 'Subscriptions' tab.
Follow the steps below:
Navigate to your 'Subscriptions' tab in your Account Settings
Click the three dots to the right of the Full User you want to upgrade to an Admin
Click 'Promote Role to Admin'
Click 'Confirm'
The Full User will now have Admin privileges. Have the Full User refresh their page to see the changes
Admins have the exact same access as the Account Owner, i.e., they can access reports, account settings, and subscriptions. They'll also receive notifications when Payouts are heading to your bank. The only thing an Admin cannot do is change banking information or generate new 2FA Backup Codes (learn more here).