Choose what you want to be displayed in the 'Your rate' box. You can optionally display other info (like duration) even if you have no pricing defined.
Reservation form page
[Price, Price breakdown, Price breakdown + Custom, Price + Duration, Price + Date, Price + Units available, Price + Custom, Custom]
Additional products page
[Price, Price breakdown, Price breakdown + Custom, Price + Duration, Price + Date, Price + Custom, Custom]