I understand that you are having some issues with the Slingbox, since you do not know how to select the right cable service provider.
You need to go to www.slingbox.com. Select the "Watch" tab at the top and then select the "Slingbox Setup" tab. Once you access it, select the "Configure Inputs" tab and run the process. You must select the make and model for the TV source and enter the right Zip Code for the Slingbox location. Then, pay special attention when selecting the right cable service provider, otherwise, you'll have to deal with the same issue once again.