Yeah I found it, if anyone else needs it... in controls go to LES-sf34a-acft-aplt-mnp and you will see Control wheel Ap Disconnect Button Pilot and there is also one for co pilot.
I have a Honeycomb Yoke and Throttle. The red button is assigned to Disc AP and FD but it does nothing. I tried assigning a keyboard key to the same command but the alarm just sings on. What am I missing? How do I silence this alarm?