A circle and an arrow may be found at the very bottom of the screen. Which is always rotating. You can fix the orientation you need by pressing, and then release the circle so that it hooks on the circular platform with the second push. Keep an eye on the arrow's fullness; the fuller it is, the longer the flight will be. In Reach the Platform, getting into a huge platform is not tough; but, getting into a tiny or extremely small platform is significantly more difficult.
Use mouse or touch the screen!