How do I change the aspect ratio to 4x3(4:3) in a CanonPowerShotA550?

I cant find the handbook. How do i change it for recording(taping)How do I change the aspect ratio to 4x3(4:3) in a CanonPowerShotA550?put it in movie mode

then press the function buttonHow do I change the aspect ratio to 4x3(4:3) in a CanonPowerShotA550?search through the menu. it should already be in that ratio unless you changed it to 16:9. just go searching through the menu and you should be able to find it or look on cannons website.