Customise your 404 Page

Customize the 404 page for your site. The 404 page is used in case an invalid or unreachable URL is entered as an internal link of the site domain; that is, in lieu of any page that can not be rendered. If a site visitor tries to access a non-existent page on your site, they will see your customized 404 page as opposed to the generic 404 page that we provide by default.

To customize the 404 page:

In the left menu, click SEO & SETTINGS, then select 404 PAGE and click the Customize Page button.
Editing the 404 page is similar to editing any other page on your site. You can drag in any widget or section, and edit content and design. However, to navigate back to the rest of your site, you need to go back to the Home page from the pages drop-down at the top of the page.
To preview your 404 page, click Preview page. You can always revert back to the original 404 page by clicking Revert to original page.

NOTE: The 404 page does not display under the Pages menu or the Pages drop-down list in the top left of the menu bar of the editor.