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Sit back. Signal for the canter at the right time.
You'll need to sit back slightly during the canter. In preparation to signal, shift your weight backwards in the saddle. You do not want to shift too far back, as this can cause you to lose to control.  Shift your weight from your pelvis to your seat bones. You should never hunch forward when you signal for the canter. Make sure you can feel your seat bones resting against the back curve of your saddle as well as the horse's back. If you cannot feel your seat bones on the saddle, you've shifted back too far. You want to signal for the canter at a time when it's easy for the horse to transition. Signal for your horse to canter just before you reach a corner or when you're rounding the corner of a circle.