How do I sign off or log out of this website? It seems I used to know how; I believe I have, many months ago, done it a whole number of times.
But now - though I have searched on every page here and opened every logo (and spent over an hour!) - I just can't find how to get the hell out of here.
I'm feeling very stupid! 
4th icon from the right at the top of the screen - it's called 'Control Panel'. Click it and at the very bottom, right in the centre of the pop-up menu you'll find 'Logout' button.
Click your user icon in the upper-right corner:
Logout is at the bottom.
There are no stupid questions!
My entire page was too large.
This is actually a very common problem and it often traps me. The software does a good job of adapting to different screen sizes, but I think the designers generally work from good-sized screens, and if you don't know what to look for, you might never realize that there is something lurking just off the visible edge of the screen.
