The process to publish a subpage is uniform across all subpages. Follow the same steps inside any subpage editor to publish that page.
1 Open the page editor which you want to publish. Click on the Publish button on the top right.
2 In the sidebar that opens, click on the dropdown and choose 'SubPage domain' to publish the page to the SubPage domain.
3 Enter the desired subdomain name and click on "Save and Publish".
4Your page is now published and is available for public view. You can link to this URL from your website.