I do apologize that you have not been able to change your TV provider on your Slingbox 350. With the recent changes that have been made, you now use the Slingplayer for desktop to reconfigure or change any settings on your Slingbox. In order to watch your Slingbox, you would use our website http://watch.slingbox.com. For further reference, please review the link below:
Sling Media Support Team!