Thanks Stevesh. What I meant was customizing the Login window for current members so they did not have to see the long Sign Up form under their user and password options screen.
I read a few options in the forum but still looking for one that matches the one I am looking for.

By the way, do you happen to know how I get to change the color of the word Login in the main page?. I have been experimenting with the stylesheet, but haven't yet found the code line that does the trick.