if you have the latest version, you can do that in Main options > Header > Site Title / Tagline > Site Logo HTML box
Put your HTML in there, you will need to add positioning style, if you need help with that, Just put the image html in and post back with a link explaining how you need the image positioned including when the browser gets smaller for mobile
If you do not have plus, please provide a link to your site with details about where you want the logo, and we can devise alternate solutions.
One of them would be to use the Header HTML and some custom CSS to move it to the right place, similar to what is explained in Item 2 of the thread below