Try these steps:
1. Disconnect the coaxial cable from your PVR and reconnect it to the coax input on your Slingbox.
2. Using the coaxial cable included with your Slingbox, connect one end to the coax output on your Slingbox.
3. Connect the other end of the cable to the coax input on your PVR.
Select one of the SHAW devices in setup. (Setup.slingbox.com)
Hope this helps,