Im' having trouble getting a new user to add in.

At first, I created my own username, did some testing, fixed some bugs, etc. Then tried to click the "Add New User" link from the top of my Console, but it kept taking me to the main login page, where it said "no login" and I couldn't login because (according to the script) I was using an invalid name/pwd.

After clicking around through a few more links, I went back to the console and the Add New User link worked properly -- so somewhere in there it is correct. But then I couldn't get to it again. Every attempt I make to add a new user now fails, and in fact I can't even log in with my original username/pwd that worked to start with. It keeps telling me it doesnt' exist. I've restarted the browser, to no avail.

Any help?

Marci