In order to change the price of the booking manually, you should open the needed booking under your dashboard > Bookings > All Bookings, change the price to the needed one in the “Total Booking Price” field and just click the “Update Booking” button.
I want to change the price of a reservation, but the procedure doesn’t work. I do not change the price and remains the previous one. Tried with version 4.6.0 and 4.7.0.