You can only add new admins at partner level if your user profile is Partner Admin.
How to Add A Partner Admin?
1. Log in to XPO Media Broker, click on Utility -> Trafficking to launch XPO ARENA (used for ad serving and trafficking).
2. Click on the XPO logo on the top left side of the screen.
3. Click on your account that you would like the new Partner Admin to access, e.g. Knorex XPO account:
4. This brings you into the partner level dashboard. Click Add User under the User tab.
5. Fill in the respective Email and Name. Select This user is a Partner user and click on the Create button to confirm the new user. The user, then, will receive an email to activate his/her account.