Do you mean your first name on your REI membership? Or in the community? Assuming you mean your REI membership, please contact our Customer Service team 1 (800) 426-4840 or live chat with them on the Contact Us link here. If you mean your first name in the community, you can change that by clicking on the ice axe icon in the upper right corner, selecting My Settings, and navigate to your Personal Information. Hope this helps!