Go to Settings > General > Finance - click the purple “Edit” button on the charge you wish to update.

Once you are on the charge you wish to update, navigate to the "Override Settings for Properties" link. Select the checkbox on the room you wish to update and enter the amount you wish to charge this particular room.

Scroll to the bottom of the page and click the purple “Done” button and then click the blue “Save Changes” button on the next page.

You have now successfully updated the charges for the selected room.