spec119 if you have a PC membership number then you can use the 'Book a flight' facility of QRs website. First make sure that you are NOT logged in to PC. There is a software error that does not show the 'miles' button later. Select your origin, destination and dates and on the next page to the far right near the top of the screen there is a slider button 'Book using Qmiles'. switch this on and then you are asked to login to PC. When the next page appears it shows availability and a price in Qmiles for the week at the top and which flights are bookable for your chosen travel day.
F.Y.I. There are over 100 threads with the words 'Award seats' within them on this forum!