1. Log in to Sitecore, and open the target page in the Content Editor view.
2. In the toolbar, under the 'View' tab, select 'Hidden Items' and 'Standard Fields'.
3. Scroll down and open the 'Publishing' section.
4. Select 'Now' under 'Unpublish'.
5. Save the page, and publish in order to apply the change to the live site.