Close the browser. Clear cache/cookies and then open the browser again. You will be logged out.
Thanks for that, keep up the good work. I was out last night so didn't have a chance to do anything. However, when I got up this morning, I was logged out. I assume there is a timeout. I had some difficulty logging back in but don't have the time this morning to try and sort it out. I have a password manager which may complicate it a little as I have had issues on some other sites following updates. Usually best to delete and set up again!