how to add privacy policy and disclaimer to footer

Just get the permalink from the page editor.

Thanks I am new to wp can you explain in a bit more detail ??

In the page editor, to the right of the page title, you’ll see the permalink to that page. You can use it to link to the page, even if the page is in the nav for your site.

thanks and how do i hide the page from anywhere else on the site

Use a custom menu instead of the default. It’s under appearance/menus.