You need to enrol to become a member of a program. Most programs are free, or free with a sign-up, with the exception of Qantas Frequent Flyer, which charges a one-time fee of $89.50 to join, although the fee is occasionally waved during promotions. Depending on the program, you must earn or spend points at least once during a set period to keep your membership current and not lose your points. For Qantas, it's once every 18 months; for Velocity, it's at least once every 36 months, for example.