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1. Go to the Organize tab.
2. Choose "Manage My Groups"
3. Next to the group you want to share, click the Share checkbox
4. Click the Manage Sharing button.
5. Enter the email addresses of the people you want to share with.
6. Choose "Read Only" (if you only want them to see your citations) or Read & Write (if you want them to be able to add citations to your group)
7. Click the Apply button.