You can't, you either have header and footers shown or pages without header and footers.
You would have to have no header and footer and simply make up your own footer and set it to appear on all pages or set it in the site code tab to appear on all pages. The same with your header just for the home page.
This is not a code related issue and you would be better suited going through Wix Support for more help with this issue.
Search the forum and you will find same posts on this like here.
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