What is a JID?
JID is the shorter term used for "Jabber ID". Your JID identifies you on the Jabber network. It is somewhat like an email address, though used for instant messaging instead.
What is the "Resource" setting for in my client?
Unlike many other messaging networks, Jabber allows you to use the same account and log on multiple times simultaneously. For example, you might have a client at home, one at work, and one on your mobile phone. Any or all of them can be connected at any one time. The resource is to identify each of these individual clients.
I forgot my password! How can I reset it?
You need to contact the administrator of your Jabber server. Contact details can usually be found on their website, if they have one. If (and only if) your login server is jabber.org then this follow this link for information on requesting a new password.