To access a service as a sub-user you will need to navigate to the gamepanel here: https://gamepanel.pingperfect.com/
Then enter the credentials the service owner have provided to you for your sub-user account - once you do this you will see their server in the gamepanel.
The features of our Gamepanel you can use is determined by the permissions the service owner sets when they set you up as a sub-user.
This provides you the ability to administer/maintain/configure the server, similar to as the owner can.
If they have any issues, please let us know, and we will assist you.