The SlingPlayer guide does not have the function to remove channels on the iPad. What you could do add the channels you wish to see to your favorites and it will lessen the channels that are being displayed to the ones you have chosen.
This article will be able to explain more about the SlingPlayer for iPad:
- How to add Favorites with SlingPlayer for iPad and SlingPlayer for iPhone/iPod touch
- SlingPlayer for iPad
Sling Media Moderation Team