Excellent video to show snowboard beginners how to land your first snowboarding jump.
When learning to pop off jumps, jump up off flat feet to start. Do not use your toe or heel edge at the beginning, as she suggests. This will likely lead you to be imbalanced off the jump (early on in your efforts), and could lead to some big falls. Big falls early usually hinder progress for most people.
You want to land balanced and flat footed, and the easiest way to do that is to jump up balanced and flat footed.
You sacrifice a little air doing it this way, but you still get plenty to learn the feeling and skill of being in the air. When you become a little more accomplished, then you can start to mix it up.