Paul Kenny explains the Two Handed Turnover, one of the most basic turnover tricks in Freestyle Frisbee.
To perform the trick, start with a rim delay. With clock spin, rim delay on your left hand. As the top of the disc turns towards you use your right hand nail to press onto the top at about 3 o’clock. This will cause the disc to tip steeper and eventually turn over. As it goes upside down, use your left hand to pull the disc up onto your right hand so that it is centered on your right hand nail.
One thing to consider is that when the disc is turned over it reverses it’s spin. That is, a disc spinning clockwise while right side up will be spinning counter clockwise when it is upside down.