Announcement is quite often used in a company, which Zdoo has included in its system.
1. Create an announcement category
Go to "OA"->"Announce"->"Categories".
Enter the categories you want to add and click Save.
2. Add an announcement
Go to "OA"->"Announce" and click "Create".
You will see the window pop out as shown below. Wrtie you announcement and click "Save" to post your announcement.