XWiki Login Issue.

Hi All, I built XWiki using tomcat, on oracle(and created the database with 36 tables) . I tried to login with username/password as Admin/Admin (as given in http://www.xwiki.org/xwiki/bin/view/Main/Documentation , for my sql in comments section); but it does not accept the user. I also see 1) Login 2) Administration on the top right corner of the browser, but there is no user creation/registration link. Please suggest if i need to create a user using some DB scripts, or if i could have gone wrong somewhere. Thanks Gaurav