Are you using the platform behavior?
If you are, it would probably be something like:
+If player touched the screen
| And screen area that was touched is > than player.X
- Set Player.VectorX to + 100 (tihs would make him go right)
- player.platform movement jump (or player.vectorY - 100) (which is up)
- Same thing but with - 100
- Same thing (- 100)
Not sure if this would work, but I think it would.