how to change website directory?

Hi guys, sorry for the noobish question,

When i set up my site i did it as http://www.mysite.com/wp now that i have finished setting everything up i want to make it so that it when people enter http://www.mysite.com it will direct so that it looks more professional.

I have tried physically moving all files from my ftp out of the /wp dir and into the root, however all the links etc have the old directory’s.

i found this http://codex.wordpress.org/Moving_WordPress however when i try do the same, its missing the fields that i need. i.e. WordPress address (URI) & Site address (URL) – so my 2nd question would be would anyone know why these details are missing? and how to make them appear again? its only missing on this specific site, when i try one of my other sites the fields are visible. i thought it could have something to do with my accounts so i made a new admin account but seems to be appearing the same.

What would be the best way to do this properly? if at all possible is there a step by step as i am really new to wordpress / websites/hosting.

Thanks

Tom