Then please follow the guide
Ah, the theme.
To my knowledge the GreenByGreen theme has no extra individual sharing function.
You may verify this by switching to another theme and enter the group url again.
Ok, so you posted an url of your group.
I still don't see the 'Greenbygreen' part. Where is it?
What do you mean with 'Greenbygreen' sharing?
Please provide the exact steps to reproduce.