If you are using the WL Member widget, there is a logout link that looks something like this:
If you haven’t installed the login widget, it’s very easy.
Go to “Design” and then select “Widgets”.
You should see the “Wishlist Member” widget in the list. Click “Add” and it will add the widget to your sidebar.
The widget itself follows the same styling as your other sidebar elements so if you would like to customize it in any way, it would need to be done within your WordPress theme.