If you‘re a group owner or manager, you can communicate information, schedules, and opinions with your group by starting a discussion or by sending messages to individual group members. If the member is your connection, you can message them directly under Manage group or send a message request to group members you’re not connected with.
Note: Currently, you can’t send a direct message to all group members at once. If you need to communicate something with everyone in your group simultaneously, try creating a group post.