How Do You Make Warwick's Q Go Behind People?

I have a Lenovo Calliope USB Keyboard. I use Quick Cast. I have tried holding down the Q key all the time while left clicking. I have tried holding Q then releasing and pressing it again immediately. I have tried tapping Q twice. I do not understand how it works. Please help. Thanks in advance. Warwick either does nothing or just does the little leap instead.
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