Adding a logout link to the wordpress menu for members

check your membership plugin's settings before adding anything. most of them have a logout menu item option built in.

A custom link to /wp-login.php?action=logout works but it doesn't carry the security nonce, so users get an "are you sure you want to log out" page first. If that bothers you, use a small login/logout menu plugin or a snippet using wp_logout_url(), which also lets you show the link only to logged-in users.