Dont!
I used the app for the ipod and it worked really well. When I purchased my 8900 I asked for the app to be transferred to my Blackberry. They did this but I have not been successful in getting onto the Network.
Basically it fails to load. Tried the support team and although they were helpful it was never ever resolved. As it ends I've paid for an application that can't be used.
For information my carrier is BT.