You join the week's course, which corresponds to your skills on skis or on the snowboard. You can complete three different levels in each league. Prince/princess, king/queen and complete the respective league on star level to enter the next league.
If you feel equally comfortable in both disciplines and join the Ski League as well as the Board League courses, you are the born Snow Crack and will receive the matching Snow Crack badge.
And now register for the course that corresponds to your skills.