I signed up for a Kids Foot Locker account. Do I need to also sign up for FLX Rewards? Yes. Sign up for a FLX Rewards account to enjoy all the benefits of membership. Related articles How do I get free standard shipping? How do I manage my FLX Rewards account? How do I join FLX Rewards? I joined FLX Rewards at Kids Foot Locker. May I still use my benefits at Champs Sports? Who do I contact if I need help?