Sign ups are open <- use this link to sign up.
They will be open until 8th October at 10am UTC (that is the middle of night Saturday night in America).
More information is available at the
info post and on the sign up form.
You can see everyone's requests in the
Requests Summary or
on the AO3 Auto App site (if it hasn't been scraped for a while you may need to press the 'Re-scrape' button).
You can see which fandoms have been requested and offered in the
Signup Summary once there are five sign ups and it has been (re-)generated.
You must include at least 1 request and 1 offer (to a maximum of 10), with at last 1 character (to a maximum of 20) and select whether you want art and/or fic for each request and offer.
You can edit your sign up any time before sign ups close by going to the
AO3 collection, clicking on the "My Sign-up" link and then the "Edit Sign-up" button.