How to set a takeoff waypoint?

[Hippo123]

Hi,

I'm trying to set up a very simple mission so that I can practice starts and takeoffs. I open the FMB, load the main map, add a plane as the player aircraft, set a few waypoints with the first being a takeoff waypoint at the aerodrome, I tick spawn parked. However the mission always starts with the aircraft in flight over the runway.

Any ideas as to what I'm doing wrong?

Thanks.