No, it is not necessary to create your own PieSync account. In fact, this may prevent you from using the integration.
Just go over to KW Command settings and hit “Connect account”.
You’ll seamlessly connect to PieSync through KW Command through the email address that is linked to your KW Command account.
KW users only have access through KW Command, where specific pricing conditions - i.e. your largest connection through PieSync is free, and everything else is 50% off - apply.