If Google Groups isn't available in your work or school account, ask your administrator to turn on Groups for Business. 
Group owners and managers can enter a welcome message for people viewing a group. A welcome message can:
- Help prospective members understand the group’s purpose.
- Show important information, such as your team’s website or email address, so co-workers know how to learn more about your team.
- Remind people of any important message, such as posting guidelines you’d like them to follow.
The message appears below the group name on the group’s conversation list.
Add or edit a welcome message
- Sign in to Google Groups.
- Click the name of a group.
- On the left, click Group settings.
- In the Welcome message field, enter, edit, or delete your message text.
- Click Save changes.
Google, Google Workspace, and related marks and logos are trademarks of Google LLC. All other company and product names are trademarks of the companies with which they are associated.