Hiding and showing an announcement will hide it from public view or make it viewable by the public respectively. Make sure you're positive you want hide or show the announcement in question. If you are sure, follow these steps to hide or show the announcement:
Make sure you are logged into an account that has permission to hide/show announcements.
From the Control Panel, select the Site Content tab.
Find and select the Announcements module.
You will be shown a list of current announcements.
Find the announcement you wish to hide or show.
Click the Hide or Show button accordingly for the cooresponding announcement in the Actions column.
The announcement list will refresh and the announcement will be hidden or visabl