If you'd like to delete an individual event:

1. Click on the event you have scheduled
2. Once the Edit Event pop up appears, click the "Delete" button in the bottom right corner of the pop up.

Or, if you'd like to edit the recurring preference for an existing appointment:

1. Click on one of the days you scheduled the appointment for and click the event
2. Once the Edit Event pop up appears, click the "Edit event details" link.
3. You'll notice if you have selected "Repeat" on the top left corner, you have the option to "edit" your recurring preferences.
4. Once you have made your changes, click "Done" and then "Save" to apply the changes.