I too bought the Win Phone 7 App for $30, then found that the Sling Tech Support could not help me connect to my Sling Adapter on my VIP-722.
The Sling Adapter is the same as their Slingbox 700u http://www.slingmedia.com/go/slingbox-700u
So if you look at http://support.slingbox.com/get/KB-1000194.html
No you won't find any help there either, but we're getting use to that.
Sling, get somebody in your Tech Support to Solve this and/or contact someone at Dish Network's Tech Support and work this out.
If NOT how do I get a refund?