Help changing site title to image

Hello all, I am building a wordpress page using Boldgrid. The site uses the Genesis framework and a theme from Imagely. Imagely is designed for Photography websites. The issue is that the Theme I am using doesn’t have an option to use an image for the Site Title. I saw some people who edit the php files, but I read the issue is that when you get an update for the theme, you have to update the php files again. Is there a plugin or other way to update a theme so that I don’t have to add php code each time the theme updates? I want an image instead of text for my site title. Thoughts? Thank you!