give it 2 waypoints i think
the first one needs to be a condition ie : this waypoint is activated when this condition is true or whatever
then on the next waypoint's on activation put trigactiv = true
and now create that trigger in the condition put trigactiv
and then fill in the activation field to whatever you want
but i cant see why you need a game logic to trigger a trigger can you just use the condition in the triggers box ? or have i got the wrong end of the question