Looks like it should be in Programming. Try this…
- Enter Programming
- Edit Point
- Go to NACs
- Select NAC 3 (then repeat below for 4)
- Edit Device Type
- There should be an option for Class B, SIGB/NACB or something like that.
- Save Config and restart.
Give this a try and see.
Manual isn’t too specific, but it might help to look through this if you’re stuck.