I'm a bit confused, because I registered as a "Committer" for the "Physics" Area51 proposal. The FAQ says
"Once you've fulfilled your commitment on a new site by asking and answering a few questions, you'll be able to commit to another site."
I've no idea how to answer or ask questions for it. There is no button anyhere (I wanted to add an "on-topic" question).
Also, there already seems to be a http://physics.stackexchange.com/ but it seems to be unrelated to this proposal, because it doesn't have that typical stackexchange look like e.g the Tex/Latex site has, and I heard someone saying that that site is an old, nearly-dead try to establish such a community.
So, where can I "fulfill" my commitment to the new community?