Hi, Ron,
Welcome aboard!
To link it to the Earth Sciences workgroup you have to go to the Metadata page (which can be found, with a little investigating) on the Talk page area, and type Earth Sciences into the Category area. At first it seems like Rocket Science (or sheer stupidity) but eventually it gets easy....
And to conform to our rules for participants in these Forums, would you kindly go to the little tab in the middle of the page that says Profile, then scroll on down to the bottom of the screen and where it says Signature, put in something more or less like:
My CZ user page:
http://en.citizendium.org/wiki/User:Your_CZNameThis will enable your profile to be easily viewed by anyone who reads one of your messages here in the Forums. And thereby enables us, up to a point, at least, to make some sort of initial judgment about how much credence/deference/respect/belief/etc./etc. to give to anything you happen to post....
Thanks!
Hayford