Just got this add- on. It is amazing. i am having a hard time engaging the auto-pilot. For some reason, the light indicating that the CMD button is on does not go on. Also, it does not hold an altitude ot heading. Auto throttle seems to work fine. The autopilot is on because when I have the lnav and vnav on, the vnav function works but not well. The plane pitches up significantly leading to a stall. I know I am doing something wrong. Just do not know why. The tutorials on youtube do not help much (although they are excellent) and the manual is way too technical for my understanding!
What am I doing wrong?