Each Video Source on your computer must have a lineup associated with it. From here, you can do the following:
Create a new SnapStream.Net lineup
This will let you automatically download the correct lineup given some information such as your zip code and your service provider.
Select an existing lineup
This will let you assign an existing lineup to your Video Source.
Delete a lineup
This will let you remove a lineup from the list of lineups currently configured on your PC.
Create a new scanned lineup
This will let Beyond TV determine what channels you have by scanning each channel one by one and seeing if there is a signal available.
Note: Scanning for channels is only available if you have selected Standard Cable or Antenna as your input.