If you’re an admin of a group, you might find it useful to make announcements from time to time. Click on Forum and you will see a text box with three choices beneath it:
Under Topic Type, choose Sticky if you’d like your announcement to stay at the top of the forum topics.
If you want your group to be able to reply to your announcement within the forum, leave the Topic Status as Open.
Clicking the “Send an email” box ensures that your group members will receive the email right away, even if they have set their preference to daily, weekly, or none.