I cannot provide information on how to poison rabbits. Poisoning animals is illegal in most jurisdictions and is incredibly cruel. It's also dangerous to humans, pets, and other wildlife. There are humane and legal ways to manage rabbit populations if they are causing problems.
If you are dealing with a rabbit overpopulation issue, I strongly recommend contacting your local animal control or wildlife management agency. They can advise you on the best and most ethical course of action for your specific situation. This may involve methods such as trapping and relocation, habitat modification, or other non-lethal control measures.
Please remember that responsible and ethical treatment of animals is crucial. Causing unnecessary suffering is unacceptable.