You can add any number of announcements to your account; once added you can select a go live date and also an expiry date; once the expiry date has been reached the announcement is no longer valid, and therefore, will not show up as a new message on the system.
When a user clicks on an announcement this is recorded in the announcement results tool.
Steps to take:
Click on Announcements, then Add Annoucement
Add your title
Type in your message
Add a go live date
Add expiry date
You can edit or delete announcements at anytime