Rover radio calibration or die!

Hi all. I am wondering if anyone could provide me with detailed instructions on how to do the radio calibration in Mission Planner? Hopefully answer a few questions as I try to get through it. I will be using RM MT12 Multi Module transmitter with the included RM RC85 receiver bound to FrSky D. I would be doing it with Crossfire but the AgentLite lua will not respond and that’s a whole different issue. Support ticket with TBS. I’ve got over a month invested in this and have only just figured out the compass calibration. So I am getting some knowledge of the Ardu system be it slowly. I am using a never used Matek F765 flight controller I have had laying around for a few years. I understand I wont have access to all features and I was only looking to use GPS nav and waypoints, RTL and telemetry. I will then decide if I want to dive deeper into this and outfit one of my planes. I would be so grateful for any help! I’m not a quitter and I have so much time invested already, Thanks!