How do I end my BIXI membership?

Hello there, I'm curious about how one would go about ending their BIXI membership. Could you please provide a step-by-step guide on the process? I've been a member for a while now, but I'm considering other options and would like to know the proper way to terminate my membership. Is there a specific form I need to fill out, or do I need to contact customer service directly? I appreciate your help in clarifying this matter.