You can go to manage booking > pricing tab  > change rate, and remember to uncheck the “Keep old price” option if you want the price to reflect the new rate :)

Thx for this question. I was also testing this out and now I have the solution

Thank you for the response!

How about when the guest is due to check out and we need to make a correction on the previous night room rate that was not updated when the guest extended.  Is there a way to correct a room rate that has already been posted?

Thank you in advance!