Hey guys, want to overlap two clips into one frame like a dissolve effect. It is not two clips on one frame (Using Size and Position).
That would be using a transition and or cross-fade. Depending on the version of Movie Edit Pro, the "how to" part of this might vary.
The simple way is to have both video clips on the same track. Take the second clip and push it into the first (the amount that is pushed into the first will determine the amount of time the cross-fade is shown. I think this method works with most of the recently released Movie Edit Pro applications