The TOGA triggers are located on the rear face of the throttles – this is a natural position for the flight crew of the real aircraft, but can be a tricky position to interact with in a home flight simulator.  

In the F70 Professional and F100 Professional, the TOGA triggers can be triggered either via clickspots on the triggers themselves, by the ‘AUTO THROTTLE TO GA’ MSFS control assignment, or by a hidden clickspot on a screw under the Captain’s Flight Director switch.