Here is how to file a flight you performed in the new Microsoft Flight Simulator:

Flights are booked as usual within the General Aviation, Scheduled, and Special Crew Pass areas.

To PIREP/File your flight after performing it, just head to the PILOT OPERATIONS area, then go to the FLIGHTS area, then choose MANUAL PIREP (MSFS) link.
http://air-source.us/Operations/OpsMain.aspThat's all there is to it!
Hopefully soon we can test to see if the new BETA FSUIPC will work with myAAS.
More to come.