Already Signed Into CHIP:
If you're already signed into CHIP, but you're not in your gym yet - you can go to upper right corner, click the 3 vertical dots [more options] and click "Join Organization." Your gym will have an access code for you to access the gym.
You can also contact your gym for a sign-up link.
Not yet registered for CHIP:
Contact your gym and they can send you a sign-up link or will have a QR code to access the gym.