[Theme Horse Support Team]

Hi Andrea,
If you add the custom logo image from Appearance->Theme Options->Design Options Tab->Custom Header then it will be linked back to main page as a link. But the header image is just a image and not a link so it will not link back to main page. We have designed the theme this way.

To add link in header image it needs code customization. You need to create a child theme and then customize the code.

Thank you!