First download and install Pidgin and open it up.
Then click on Accounts then Manage or Ctrl+A
Next Add Protocol XMPP account and fill in Basic information and check Create this new account on the server, then click on Advanced
Then check Require SSL/TLS and save.
Wait a minute and it should open a new window to Register New XMPP Account, put in your Username and Password then click on Register, once that is finished you can check the box next to your new XMPP Account and it should log you into the server.
Once you have connected click on Tools then Room List and Get List, once you have the list double click on one.
Hope to see you there!