Billing Account administrators may view the list of users who have been granted access to a particular application. However, they are not able to make any changes to the permissions list, unless they have been given administrative rights access to the application.
To view the list of users who have access to a particular application:
Click the Apps tab.
In the App Name column, click the link for the application that you want to view the permissions list for, and then click View Users (on certain service plans, this link is named Manage Users).