Making xmpp account on jitsi

Hi guys, for the desktop version I need an account and the manual say it is to be made on
But does not work!
How to make an account?

Thx Pit

That service is no longer alive.
You can choose any xmpp or sip provider.

Clear, but can I make contact with a conference room?

No, Jitsi Desktop is a different app with different goals.