To modify a rail journey there are 6 simple steps:
Select Train to Amend: From your booking confirmation, locate the journey you need to change and select "Modify Train".
Select Journey Leg(s): Choose the leg(s) of the journey you wish to change by checking the relevant box(es).
Enter New Travel Details: Input your desired new travel dates and times and click "Continue".
Choose Preferred Option: Select your preferred option from the possible alternatives.
Complete Checkout: Proceed to "Checkout", this follows the same process as when making a new booking. Any required company data will automatically pulled through from the original booking.
Access Updated Booking: Once the modification is booked, you can find the details of your amended booking and tickets within the "My Trips" tab or "Upcoming Trips" section of your landing page.
For more information on amending your rail journey have a look at the Rail User Guide.