I understand that you want to how to use the Coaxial inputs / outputs on the Slingbox PRO HD.
The coaxial input / output allows you to connect either the basic cable service or a TV source. You only need to take the coaxial cable that comes from the wall and hook it up into the Slingbox PRO HD coaxial input.
You can also use this input in order to establish a pass-through. Even though it does not include any information about the Slingbox PRO HD, feel free to check this link in order to get some information about the available inputs and connections to make.