changing form subdirectory url help

Hi, I’m trying to change so that my site looks like its installed in its own directory or whatever so it runs from example.com rather than example.com/wp

I’ve followed the steps given here:
http://codex.ww.wp.xz.cn/Giving_WordPress_Its_Own_Directory#Using_a_pre-existing_subdirectory_install

The site runs on example.com now but without any themes applied to it and when i try to log in to my site using example.com/wp/wp-admin I get the following:

Not Found

The requested URL /wp-login.php was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

Ok so I’m pretty clueless with this sort of stuff so if anyone could point me in the right direction, that would be awesome.