To manage your booking with Lufthansa, follow these steps:

1. Visit the Lufthansa Website: Go to the official Lufthansa website using your web browser.
2. Navigate to "My Bookings": Look for the "My Bookings" or "Manage Booking" section on the homepage.
3. Enter Your Information: Input the required details, which usually include your last name and booking reference or e-ticket number.
4. Access Your Reservation: Once you've entered the necessary information, click on the "Find Booking" or "View Reservation" button to access your booking.
5. Make Changes: Depending on the options available, you can make changes to your booking, such as selecting seats, changing flight dates or times, adding special services, or updating passenger information.
6. Confirm Changes (if applicable): Review any changes you've made and proceed to confirm them if required. Be aware that some changes may incur fees or additional charges.
7. Save or Print Your Updated Itinerary: After confirming changes, save or print your updated itinerary for your records.
8. Contact Customer Service (if needed): If you encounter any issues or need assistance, you can contact Lufthansa's customer service for further support.
9. Confirmation: After making any changes, you should receive a confirmation email with updated details of your booking. Double-check this confirmation to ensure all changes are accurate.

By following these steps, you can efficiently manage your booking with Lufthansa through their website via Lufthansa manage booking.