To modify a rail journey there are 6 simple steps:
Navigate to "My Trips": From your Melon homepage, go to the "My Trips" section.
Select the Trip Tile: Choose the specific trip you need to amend.
Expand Train Details: Scroll down to the train details and click the arrow symbol (">") to view additional options.
Select Train to Modify: Click on "Modify Train" to proceed with amendments. Enter your desired new travel dates, times, or class upgrades if needed.
Review Cost Differences: Check the displayed cost difference for any proposed changes or upgrades before proceeding.
Confirm Your Changes: Confirm your modifications, and an updated itinerary will be sent to your email immediately.
For more information on amending your rail journey, have a look at the Rail User Guide.