Hi Dave,
You need to go into SkyDemon/Setup/Connectivity Options. Tick FLARM and enter code 6000, then back on SD select 'Go Flying' and 'Use FLARM'
You may also want to set preferred traffic altitudes in SkyDemon/Setup/Navigation Options and also select 'Show Bearingless Targets' if you want to see Mode-S contacts.
Regards
Peter