Step 1) Establish rep on a site that B hangs out on, like breedbay or tsd (which seems to be down atm) Pics of plants help. You shouldn't have a problem with that.
Step 2) Periodically, he will post up a big ol' list and ask people who is interested in testing what. Ask nicely to test something, and if you're quick enough you will probably get to test something. He asks for people who can run at least 7+ from a pack at once, to ensure a nice variety of phenotypes. That's pretty much it. I think that this round is probably full up by now, but I'm sure there will be more in a few months.
*edit*
Since these were just my own stuff, I didn't do any shots before I chopped her up, I had two more girls that were all right, but not as exceptional as the mother, this was definitely the best one. I have around another 50 of these beans to go through, so this was mostly to see if it would be worth my time to do a large run of them to do some real selection.