If you want to add a login logout item to the navigation menu, past the following code to functions.php:

// Registers Featured Image Sizes

if ( function_exists( ‘add_image_size’ ) ) {

add_image_size( ‘index_thumbnail’, 0, 0, true );

}

add_filter(‘wp_nav_menu_items’, ‘add_login_logout_link’, 10, 2);
function add_login_logout_link($items, $args) {
ob_start();
wp_loginout(‘index.php’);
$loginoutlink = ob_get_contents();
ob_end_clean();
$items .= ‘

‘;
return $items;
}