If your sat box has a coax output to feed to a television you can plug it into the middle coax position on the back of the panel shown. Of course this removes your park cable input. Your sat box would have an output on a specific channel on the tv most likely and you change channels via the box of course.
You must have the wall box turned off when using the satellite signal or you will get snow from the roof antenna interference.
If this information works for you there are some simple modifications to the wall plate while you have it out that will make things more flexible