A. 1. Check the app for an option to modify your booking. This is often found in the 'My Trips' section. If available, follow the prompts to change your itinerary. 2. If the app does not allow changes, visit the ferry operator's website to see if you can modify your booking there.

B. 3. Keep a record of your original itinerary and any changes you wish to make, as this information may be required when contacting customer support for assistance.