Editing Horizontal menu in header in a template with custom code

I have installed the theme The Scenery, and have opted to have a static page be my main page. The result is that I now have two “Home” tabs in the menu (the one on the left redirecting to the other), and when I click on the “blog” tab, it visually links up with the left “Home” tab.

I have tried to locate where this is written in the code, but the template appears to be written in custom code. What I would like is to have one “Home” tab in the menu, with an “About” subpage, and a “Blog” tab that doesn’t visually link with any other tabs!

Here is the webpage:

Any help would really be appreciated. Thanks!

Jeremy