You need to adjust them, there is a little hex adjuster on both sides. turn it all the way tight then back it off. You will feel it "click", count the clicks so both sides of both pedals are the same. Your foot should pop right out with a slight outward twist of your heal. Its best to play with them on soft ground like a grassy field where you can fall and not get hurt.
Remeber they are not ski bindings!