/** ******** ******** ******** ******** ******** ******** ******** ******** 
* TITLE:       UserPro: Conditional Log-in / Log-out
* DESCRIPTION: Add Login / Logout to your WordPress Menu. You must have UserPro
* 
* http://userproplugin.com/userpro/forums/topic/display-logout-link-after-login/
* http://jsfiddle.net/HZscB/
* 
*/
function userpro_add_loginout_navitem($items, $args ) {
	//Change "avia" to your theme's main menu location
	$theme_location = 'yoo_avenue_wp'; 
	$current_user = wp_get_current_user();
	if( $args->theme_location == $theme_location ) {
		if ( !(is_user_logged_in()) ) {
			//login display
			$login_item = '<li class="nav-login menu-item"><a href="/profile/#" class="popup-login">Log In</a></li>'; 
			//login display
			$login_item .= '<li class="nav-login menu-item"><a href="/profile/register">Register</a></li>'; 
		}
		else {
			//logout display
			//$login_item = '<li class="nav-login menu-item">'.wp_loginout($_SERVER['REQUEST_URI'], false).'</li>'; 
			//logout display
			//$login_item = '<li class="nav-login menu-item">'.echo $current_user.'</li>'; 
			$login_item = '<nav>';
			$login_item .= '<ul>';
			$items .= '<li><a href="#">'.$current_user->user_firstname.' '.$current_user->user_lastname.'</a>';
			$items .= '<ul>';
			$items .= '<li><a href="/profile/">My Profile</a></li>';
			$items .= '<li class="nav-login menu-item">'.wp_loginout($_SERVER['REQUEST_URI'], false).'</li>';
			$items .= '</ul>';
			$items .= '</li>';
			$items .= '</ul>';
		}
		$items .= $login_item;
	}
	return $items;	
}
//add_filter('wp_nav_menu_items', 'userpro_add_loginout_navitem', 10, 2);

http://jsfiddle.net/HZscB/

Add Login / Logout to your WordPress Menu. You must have UserPro

Wordpress: UserPro Conditional Log-in

wordpress

PHP