Announcements are grouped by a topic which can then be used as a Filter on the newsfeed. You can assign a topic when you create an announcement, or change and assign a topic when you edit an existing announcement.
By default there are five topics:
Your action required
Create a new topic
If required you can add new topics.
Click on your name on the top right, then click Settings.
On the settings menu click Announcements.
Click Add new.
Enter a title for the topic
You can assign a specific colour for the topic.
You can see how many times a topic has been used. Topics can be ordered by dragging them using the arrows icon. The order of Topics in the table influence the order in which topics appear on top of the newsfeed.
If you need to edit a topic click on the pencil icon, to delete click on the rubbish bin icon.