Hi Fred,
The GTalk URL is talk.google.com
To create this account, simply open the WildFire preferences, click New, select the GTalk account type and enter your username and password. The default server URL should be pre-filled automatically.
One thing to be aware of though; you cannot see your own status in GTalk. If you wish to double check it is set properly you will need a friend to login to GTalk and take a look.
Unfortunately G+ does not work with WildFire yet, as the G+ API does not support setting a status yet.
Best Regards,
Andrew