Wordpress navigation menu question

Anyone know how to make a URL link for Wordpress in the menu bar?

For instance suppose I have a blog, but it's not the root directory. For instance:

mydomain.com
mydomain.com/blog

And I want to put a link on the menu bar from the root directory to the blog, and from the blog back to the root directory.

Which file do I need to modify? Do I need to have php knowledge or will a basic understanding of HTML be enough?

Thanks

 

go to settings and insert the WordPress address (URL)... where wp is installed
then change Blog address (URL) to the desired directory

see wp codex for more info
http://codex.wordpress.org/Giving_WordPress_Its_Own_Directory

 

Here is a guide that might help: Add Home link To Your WordPress Blog

 

It seems like it should work, but the installation (Fantastico) might be giving problems. I have "Home" and "Blog" on the menu bar, but they both point to mydomain.com/blog (yes I only changed the blog URL)

I've been having trouble with a template that should be displaying things a certain way and it's not (I copied the exact settings from another website) Anyway I guess I'll just have to use the sidebar on this domain, but I'll try it on the next one.

Thanks

 

I originally wanted it in the top menu bar which he doesn't explain, but it looks like I'll need to use it in the sidebar anyway.

Thanks