I assume you just want to log off and then log in again later. Just go to 'Options' top right next to where it says "Hi Dot 345"click on scroll down menu and click on log off.

I never bother to log in or out, but if you mean you want to delete your membership and not just log out, Dot345, use the Contact Us option at the bottom of the page and send a message to the site owners - they are the only ones who can delete a membership.

Like Bamboo I never log off from here. I have saved this site in my favourites and I use that to come into Goy each time. Its much easier that way.