Sign-out

I know I'm going to be embarrassed when I see how obvious it is, but I can't find how to sign out of the forum.  

Could someone please point me in the right direction?  I'm not leaving, I just want to log out to see if it makes a difference to a problem I'm having with YT thumbnails not displaying.

Thanks. 

On desktop, cog at top left near your username.  On mobile, link right at the bottom of the page.

Thanks Jonathan  -  I knew I would be embarrassed. 

We are all just prisoners here
Of our own device.

Funkfingers said:

We are all just prisoners here
Of our own device.

It was beginning to feel like that until Jonathan pointed me in the right direction. 

I just need to solve my lack of YT thumbnails now, it was nothing to do with being logged in or out. 

Top tip - if ever you can't see how to log out of a site, you can clear the cookies for that site only in your browser (just look up how to do it on your specific device). It has exactly the same effect.

Thanks Digitalscream - I'll remember that, although having suffered the embarrassment of having to ask where the log-out facility is, I don't think I'll forget again. It could be useful for other sites.