Carriers can update the ETA with at least 24 hours notice prior to the appointment. Follow the steps below:  

1. Go to My Appointments
2. Find the appointment by filtering the date accordingly or searching by PO number/Confirmation number
3. Select the appointment 
4. Click on 'Provide ETA'
5. Select the date and time
6. Fill out the "Reason"
7. Click on 'Provide ETA'