If you're installing the demo, the first thing you should do is log on with
username: admin
password: admin
That should get you past the login page.
If you want to create a link on the login form to sign up, there are instructions at
http://www.jpdeni.com/dbman/Mods/bugfix.txt. Scroll down the the bottom of the page. Copy the subroutine there and paste it into your html.pl file, replacing the current sub html_login_form.
The other thing you can do is to access the demo as a default user, without logging in at all. Use a URL like
http://
www.server.com/cgi-bin/dbman/db.cgi?db=default&uid=default
Change the text in italics above to match the location of your DBMan files.
JPD