I finally rediscovered the link for how to get a free BME t-shirt: you review experiences submitted by website users. They’re not looking for heavy copyediting or anything like that, just verification that the submissions are actually about body modification, that they are not written entirely in netspeak, and so forth. And once you have reviewed 500 experiences - the first level at which you earn anything - you get this t-shirt. Needless to say I am reviewing experiences as fast as I can, which unfortunately is limited by how fast they come in!