Contact Us Page

https://halo-electronics-demo.mybigcommerce.com/contact-us/

Go to Storefront -> My Themes -> Customize. (If your store is a new store, you may need to go to Channel Manager -> Themes -> Edit Theme)

In the Theme Editor -> Go to Other Pages / Contact Us Page

When you are happy with your changes, don't forget click Save and Publish to repackage the edited theme.