It isn't possible right now.

mfoss — Fri, 21 Dec 2007 17:24:28 +0000

It isn't possible right now. I couldn't find any reference to such a feature request, so I submitted it here: Web page for account registration.

Writing a very simple page seems easy. Of course more complex stuff would take more time to implement: like asking for two passwords, compare them and reject; or captcha support.

ejabberd - Comments for "Web form to register a new user?"

It isn't possible right now.