Let's Control It

running RFLink with Home Assistant

looked all over but can't find any information on controlling the onboard LED's on both the arduino itself as well as the rflink board

please point me in the right direction

Is this video of any help?
https://www.youtube.com/watch?v=dqjK-LWDwE4

The RFlink firmware controls the leds.
What do you mean with "controlling" or what are you trying to do?