Thank you for posting to the answers forums! I understand you are trying to configure another source, I'd be happy to help with that! In oder to configure the inputs on the Slingbox what you will want to do is connect to the Slingbox on a computer. Once you configure the inputs on the computer you should be able to switch between the sources on the SlingPlayer for iPad.
Here is a link with instructions on how to configure another input:
Hope this helps!
Leanne - Sling Moderation Team