Frequently Asked Question
After creating a group, or being set as an owner, you can then modify the group properties and membership. If it's a public group then anyone can join, but for private groups one of the owners will need to add people. If you're not an owner, you can only leave the group or change your preferences for notifications.
After selecting your group in the folder list view (underneath your mailbox - press Ctrl+6 to go into this view), click the GroupĀ Settings button in the ribbon. This will display a menu of options to Add/Invite others, or edit the group itself.
If you need to modify ownership permissions, this can be done via the Edit Group option.