This is already featured inside the theme, but it’s only setup for Sub Menus. If you look at the Demo and click on the Sub Page 1.1 page right under the Sample link in the Menu, you’ll see the page is highlighted when it’s the active/current page – http://demo.appfinite.net/aspire/sample/sub-page-11/
To make it work for Top level menu links, you can add this – .genesis-nav-menu .current-menu-item > a
to the menu code. If I add this to the demo around line 1315 like this –
.genesis-nav-menu a:focus,
.genesis-nav-menu .current-menu-item > a,
.genesis-nav-menu a:hover {
color: #fa5738;
}
….then it works for any of the top level links.
I’m not sure where in your CSS it would need to be added in since I don’t have a link to your site, but if you can locate and edit the code above it should work fine. If it doesn’t work I’ll definitely need a link to your site in order to see what part of your code needs adjusting.