Here's how you can update/edit the frequency of recurring appointments.
On your calendar, click on the recurring appointment you wish to change.
Click on Actions > Manage Recurring Service.
On the next page, click on the Adjust Service Frequency.. button right under the recurrence. You can also find it under Actions.
A new pop-up window will open. Under the Repeats section, expand the drop-down menu and pick the new appointment's frequency.
You can also change/adjust the time as well as the day it repeats.
This window will also let you pick from which date you want your changes applied.
Don't forget to click the Adjust Frequency button once you're done.
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