Menu issue with multisite


I have someone who created a subsite but made a ton of changes in the template. Now I'm trying to figure out how I get the page at to instead OR simply make the visitors land on that page instead.

Also, when I'm looking at the product (fitness program) or in the checkout process, the menu links don't work (they are anchored on the home page), except the contact one since it's also on the page.

Thank you!