user profile help

[eluser]Unknown[/eluser]
Hi been using Ci for the past month or so i looking into doing user profiles, ive been looking at the URI (if im correct)

im trying to achieve http://localhost/index.php/user/sam (for example) then that will use URI to grab the last segment (2) and display user details

but im getting


404 Page Not Found

The page you requested was not found.

help?