CKAN uses OpenID for user authentication. You therefore do not need to register a new username and password to use this site - instead you can reuse your existing openid account.
If you haven't already got an OpenID it is easy to get one. Probably the simplest way is sign up with a free OpenID provider such as https://www.myopenid.com/.
If you have already got an OpenID just visit the ${XML( h.link_to('login page', h.url_for(controller='account', action='login')) )} .