Read your manual. It pretty much tells you everything that you need to know about how to send something with the Succ-U-Bus. You will need to know how to use many of the features of your PET to get the Succ-U-Bus working.
The key thing is to figure out how to give the proper destination to the Succ-U-Bus.
Use the designer room chevrons. (One of the PET modes is just for those codes.)