Hi Alex,
If you look at the front page of the manual here
http://www.usa.canon.com/app/pdf/len...0EX_manual.pdf you'll see that there is a little plastic stand that the flash sits in. You obviously don't need a Canon one as the hotshoe is a universal size, so this should fit the bill
http://www.amazon.co.uk/Universial-5...2918513&sr=8-3
Nick