Settings \ Organization \ Announcements
Select the Announcements Tab to Add, Edit or Delete Announcements.
For example, you may want to have an Announcement welcoming Users to SAFE.
Click Add to bring up the Add Announcement screen. Next, type in the Required message you wish to display and give it a Required Start and End Date. Finally, select what Type of message you want to display. Will it be a Warning, Success or simply an Info message? Finally, click Ok.
Your Announcement will then be displayed to all Users when they log in. You will also see in Settings \ Organization the Message itself, it's Start Date, End Date, and who created it.