Add this code in your theme’s functions.php file.
function addHomeMenuLink($menuItems, $args)
{
if('main' == $args->theme_location)
{
if ( is_front_page() )
$class = 'class="current-menu-item"';
else
$class = '';
$homeMenuItem = '<li ' . $class . '>' .
$args->before .
'<a href="' . home_url( '/' ) . '" title="Home">' .
$args->link_before .
'Home' .
$args->link_after .
'</a>' .
$args->after .
'</li>';
$loginoutlink = wp_loginout( home_url(), false );
$menuItems = $homeMenuItem . $menuItems . $loginoutlink;
}
return $menuItems;
}
add_filter( 'wp_nav_menu_items', 'addHomeMenuLink', 10, 2 );