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Viewing existing entries can be done by clicking 'List all' in the events menu, then selecting the 'Tools' menu at the top right of the page. Within that list will be a 'Recurring Events' option which will show all recurring entries which are setup.
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These can be added to, edited or removed as needed. Editing or deleting any existing entries will not change any of the events they've previously been associated with or have previously created.
Permissions required
To setup new, or manage existing recurring events, you will need to have 'manage' level permissions to the event you're wanting to base the recurring entry on.