Changing webisite address

Hi
I have a server on a domain i own.
I have wordpress intalled on the server inside a folder called “wordpress”.
To view the homepage i have to go to “www.homepagename.com/wordpress/”.

What i want is to have to go to “www.homepagename.com” to view the homepage.
How do i do this?

I remember following some instructions from somewhere ( wikipedia i thing, but im not sure ), but it just made my homepage inaccessible and i had to reset everythign.