Settings Manager showed up but I can't click on it.

While I was making an image on the website pixlr.com's editor, I came across a problem I accidentally brought settings up. Of course I've had experience with these type of problems before and was going to easily click close and take it off, BUT, it wouldn't let me click on it. I tried using the keyboard and I can navigate using tab but I don't know how to press close using the keyboard. I'm panicking and now trying to close without closing out the picture I didn't save.