Administrators can edit or delete any announcements at any time.
Editing Announcement
Click the Feed tab in the Top Menu and select from the list: Manage feeds.
Next you can see Feeds and Announcement list.
Choose a Announcement you want to edit and click the 
pencil icon.
You will see the same functions which were when you create a Announcement.
Announcement
- Basic
Administrators can edit name, content and change start/end date.
- Advanced
This option allows administrators to edit button names, configure what will happen when user selects the Dismiss button and to make changes to the URL address to which users will be redirected after pressing the selected button.