How do you edit the Main Nav menu (without using dashboard)?

[bbguy]

I have 4 simple buttons on my navigation bar. Instead of going to Appearance --> Menus to try this, which file would I edit with the editor? I have looked through all of them and I just see things like nav-menu and top-menu. It's like maybe they are objects that are being called or something. I'm pretty new to this and realize that's probably wrong.

I can see where in my header.php that my menu is being pulled in (I think) but I just can't figure out where to edit it - example being if my Home button points back to the frontpage of www.mysite.com, where would I edit that link at in the actual code, if I wanted it to point somewhere else?

I did use the Menus option to recreate my menu and even added a custom location that way, but I still don't see where it changed it in the code.

[bbguy]

Don't see an edit button - just in case it needs to be said i'm using Wordpress with the standard Godaddy business theme. I think it's called Real Humble Hero. I just needed something simple and to the point.