I did a default install through Softalicious and WordPress is now installed in a directory called "WP". I want to change the directory name to the name of my blog so the address is "mydomain.com/blogname" instead of "mydomain.com/wp". I have found a support document on WordPress for giving WordPress it's own directory but it doesn't make sense to me. Specifically it says to copy the index.php from the wordpress directory into the root, but that means I would overwrite the existing file which is for the website I believe (of which I have used SiteBuilder). I looked in the existing index.php on the root and there is a lot in it.
My question then: what is the easiest (and safest) way to give the WordPress directory a new name?
FYI I do have technical skills and understanding but not to the point of easily understanding what the .php files do. Never edited them manually before, nor written a web site etc (hence using Sitebuilder), but I do know how to open an editor, directory structure etc....