Need php help editing a template

On this blog: http://mozellstudios.com/blog/ I am trying to add a “Home” button on the horizontal menu bar – its not currently an option. The Theme I downloaded is “Persephone 1.1 by Themocracy”. I’ve tried to add

• Home

to the Header page without success. I believe I need to add a command to the following function, which appears in Functions.php.

function ap_buildMenu(){

		$mo = ap_getPageMenuOrder();
		$exc = get_option('ap_pagesOmit');		

		$excString = (!empty($exc)) ? '&exclude=' . $exc : '';

		wp_list_pages('title_li=&sort_column='.$mo. '&depth=1'. $excString);
		return NULL;
	}

What should I add?
Thanks!