Thank you for writing in, is your
blog.suppz.com homepage is an index blog page? Sorry, I can't view it because your site is under a coming soon page. If so, then you can follow the guide provided here.
If your Homepage is static and built-in Content Builder, please follow this guide.
Add new section on top of your page and remove its spacing.
Then add an Image element on that section, make sure it is a high-quality image, equal or wider than your site's max-width.
Regretfully, there are no demos for PRO. But PRO has a Design Cloud which offers you to import templates that you can use.
Template Manager - Design Cloud
Hope it helps,