The Mortgage Calculator itself cannot be edited.
You can edit the More Calculators, Get Pre-Approved and Apply for a Loan buttons:

Note: Any changes made to the “Apply for a Loan” or “Get Pre-Approved” button will also be updated on the “Mortgage Rates” section/button.

  • Click on the house at the bottom of any page and log into your Admin Menu.
  • Choose Edit Website Contents.
  • Click the Calculators button.
  • Click on the yellow Edit button above the More Calculators, Get Pre-Approved or Apply for a Loan buttons.
  • You can choose the default link: Eloan®, Select a page from your site or enter a URL (link) to a different site.
  • To disable and hide the button check “Disabled – hide button and link”.
  • Rename the button enter the new name in the “Rename” section at the bottom of the page.
  • Save Changes