How do we update our profile photo?

Well, I found this, it might help you. You can't do it directly from here, you have to talk to the back end that runs the forum.

https://www.farsightprime.com/help/account-settings/how-to-add-a-profile-picture-on-a-vimeo-ott-account-via-gravatar

I haven't even set one in the first place. Didn't feel the need.