Images in the Homepage

Hi there,

I want to change that images “Headline that grabs people’s attention”, “Highlighted Section” & “Featured Categories” but I don’t know WHERE to change it.

I have access to edit through Bluehost> Themes AND I can edit through Appearance> Customize and neither ways I can change that images.

Can someone help out a newbie here?

cheers

The page I need help with: [log in to see the link]