Yes, you can edit a recurring appointment at any time.
Edit a recurring appointment
Open the appointment from the Calendar, My Appointments, or Client Profile
Click Edit and make your changes
Choose how to apply the update
When editing a recurring appointment, you will be prompted to choose:
Update only this appointment
Update this and all future appointments in the series
Watch how to edit a recurring appointment
This gives you flexibility to make one-time changes or update the entire series moving forward.