Visit the official Lufthansa website at www.lufthansa.com on your favourite browsing platform.
Find the Menu Tab.
Select the "Book and Manage" Tab at this point.
Select the view and edit in-flight details option.
Enter your login information, the last name of the traveller, and the confirmation code.
Select "Submit" from the menu.
Now look for all the modifications you wish to make, such as a change in flight destination, change in seat assignment, change in name, change in time, etc.
Select a new flight at this time based on availability.
The next step is to pay the Lufthansa change flight penalty and, if applicable, the fare difference between the new and old itineraries.
Last but not least, make sure you receive a confirmation message on your phone or email with the new e-ticket.

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