Members can add/update their billing information in a couple ways on Triib:

A member can open up the Triib mobile app, tap the menu icon in the upper left corner, scroll down and tap Billing, tap update credit card, enter the information, and tap Save card.

Log in to the online portal using the gym's member facing Triib site, most often resembling my-gym.triib.com/accounts/login.

Select Profile in the top right corner > select Payment Method > select Credit Card or Bank Account > add information and save.