It is a lot easier to set up your scna lists on the software. But you can also set one of the P buttons to "Scan Add/Delete (Tag)", and add delete channels from the scan list on the fly. To switch the scan lists, you press and hold the "Scan Start/Stop" button for 2 seconds. That should show you the name of the scan list you are currently using. The use the Up/Down buttons to scroll through the available scan lists, then momentarily press the scan start stop button again. now, when you press the scan start stop, you will scan the scan list you just selected, and you can add delete channels to/from that list
With the MDC, it is 2 parts. You have to turn "ON' MDC from the MDC folder, then in the channel folder, which ever channel you want to have MDC on, in the MDC column set that channel to "System 1", or which ever MDC system you set up in the MDC folder.
Steven