The instructions below are all I can locate, very limited directions. A demo video on input for flight plan using ap and fms would be very helpful or written instructions. I can do ils landing ksjc-ksmf mostly ap at this point fms sort of iffy, mostly guess work. Similar issue with Eurofighter typhoon.

ENGAGE: To engage autopilot, you have to engage the «autopilot» button to ON or AUTO.
SET PARAMETERS: To set the autopilot parameters, use the lower part which display programmed parameters and use +/- buttons to change the values. BE CAREFUL: in AUTO mode, saved parameters can be automatically changed by the aircraft actual parameters when you will arm the autopilot (speed or altitude for example).
SELECT and ARM: To select the parameters that will be used by the autopilot and arm them, you just have to touch the square part of your choice on the upper part of the autopilot. BE CAREFUL: some parameters can’t be used together. One of them may be disengaged automatically. To use FMS parameters for autopilot, engage the VNAV square part (lower right