In order to create and edit events as a group, you'll need to enable "2.1 Manage Event Relationships and Binding" in the Basic Options tab of Series25 Group Administration.
Additionally, remember that even though they're in a group, related and bound events are still separate objects with their own object security. Make sure you have appropriate permissions to view and edit them, the same as you would any other event.
When you edit an event in a related event set, you're given the option of editing just the current event or of selecting any or all events in the relationship for editing. If you choose the latter, a new tab is created for each event you're editing.