In your group homepage, on the right side menu option it says "Post News / Message" you can use that. Write your message, and submit. It will then get sent to everyone who is a member of your group.
Help with my group!
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Kohai, I have never, in any chess program, found such helpful, rapid advice as you and the rest of the staff provide. Congratulations!
thank you
How do I send a message to the members of my group about a team match?