@sallysquirrell To add the logo image, in the dashboard go to Appearance->Theme Options->Design Options Tab->Custom Header.
Upload the header logo image from there and check on ‘Show header logo image’. Then click on save all the change. The logo you add
as header logo image will link back to home page.
is it also possible to add a text behind the logo (text following the logo, so that both text and logo could be displayed and not only one of them) which would look like e.g. as following: