If you want any of the Aerobie discs to fly straight, release them level. When people throw conventional flying discs they tend to release them sloping downward to compensate for their tendency to roll over in flight. With Aerobie discs, this compensation is not needed so throw them level if you want them to fly straight. You can throw an Aerobie disc sloping to the left if you want it to curve left and sloping to the right if you want it to curve right.
As is the case with any thrown object, throw an Aerobie disc only to an alert catcher. Play in a clear space so participants will not accidentally trip over or crash into trees, cars, people, and other hazards. Cease play if there is insufficient light to clearly see the disc in flight.