How do I use Qantas frequent flyer points to travel from Shanghai to Prague?

Hello I have tried to book flights on the qantas website to travel from Shanghai to Europe but it will not allow me to do this. Any advice is greatly appreciated!

I don’t have any issues using points for this. Remember to click the ‘Use Points - Classic Flight Rewards’ radio button instead of Points + Pay or Cash. And also remember to select ‘Shanghai Pudong’ Airport which is the larger international airport in Shanghai.