After making a booking:
Log in...
My Eurotunnel account holders - Log into your account, (using your registered email address and password) and select "Add API" on your upcoming booking.
Guest/Direct bookings - click here to log in using your booking reference number and password (found on your booking confirmation email), and select "Add your API now".
Trade/Other booking types - click here to log in using your booking reference number and password.
Add your passengers
Click "Add passenger" to add new passengers, or "Edit passengers" to make changes.
Click "Add new person" to add a new passenger to the booking or your My Eurotunnel account.
Click + or - on a passenger to add or remove them from a leg of the journey.
If you make a mistake adding a passenger click Details and then "Delete this person".