Complete Novice - Background image on registration form
SOLVE
Changing the banner/background image is independent of the form itself. You can usually change it on the banner/image module itself or in the template to change the default image.
I say usually because I see you're on Starter and maybe using a Starter templated created by HubSpot. These are great for getting up and running quickly but they are also extremely limited in what they can do compared to normal templates. If that's the case that may be the issue you're running into, so I'd start with looking at the template you're using.
Complete Novice - Background image on registration form
SOLVE
Changing the banner/background image is independent of the form itself. You can usually change it on the banner/image module itself or in the template to change the default image.
I say usually because I see you're on Starter and maybe using a Starter templated created by HubSpot. These are great for getting up and running quickly but they are also extremely limited in what they can do compared to normal templates. If that's the case that may be the issue you're running into, so I'd start with looking at the template you're using.