Sanket,
I am usind Jabber2 which supports the XMPP Protocol standards. I just dont know how to add nely registered users. I will try wildfire and get back.
You need to use any compatible client and from there create a new account. There is no interface, which allows you to create account from a webpage.
In wildfire its the same case, just that they have some enhanced support, but its costly like $3/account.
So any case, download PSI client, this shall make your task simpler.
Hope that helps.
Thanks & Regards, Mitul Limbani, Founder & CEO, Enterux Solutions, The Enterprise Linux Company (TM), www.enterux.com