Visit RumbleTalk and log in to access your dashboard.
Click on the 'Settings' link.
Click on the 'User Management' link.
Click on the 'New user' link at the top of the screen.
FIll in a Nickname and Password for the user, then set the 'User role' to 'Room administrator'.
Click on the 'Chat Room' drop-down and select which room the user should have admin rights for.
Click on the 'Save' link at the top of the screen.
Click on the 'Manage users' link at the top of the screen.
Make sure that everything is as you expect it to be.
Access the chat room via the direct link or from your dashboard.
Click on the 'Click here to join the conversation...' link at the bottom of the chat window.