What is “Wiccan rede”?
 
It’s the basic Wiccan teaching which is; “An it Harm None, Do as Ye Will”.
Rede doesn’t “order” a wiccan to not to harm anyone or anything, but says that an act is acceptable when it doesn’t harm anything or anyone. It’s not a pacifist saying, but charges ethical responsibility to the practitioner.

Other than being a rule, Rede is an advice. Often, it’s been confused with Aleister Crowley’s law of Thelma (“Do what thou wilt shall be the whole of the Law."), or said to be an alternative version of that, they do not have any relation in reality. They’re the ethical codes of two completely different systems.