Add image to header

In the studio theme, at the top of the screen is a black bar with the links for Our community, main menu and such. I want to be able to add a small logo in the upper left hand corner. I've looked thru the site admin and the header.php file and cannot find where to add it. I'm sure I'm just missing something simple, but I can't find it, so It's not simple to me. Thanks for all your help.