Simple add this code in your functions.php
/* LogIn and LogOut Link */ add_filter('wp_nav_menu_items', 'add_login_logout_link', 1, 2); function add_login_logout_link($items, $args) { if( $args->theme_location == 'top-nav' ) { ob_start(); wp_loginout('index.php'); $loginoutlink = ob_get_contents(); ob_end_clean(); $items .= '<li>'. $loginoutlink .'</li>'; } return $items; } /* LogIn and LogOut Link */