My rabbit can't move and won't eat. What emergency steps to take?

Oh dear, I'm quite concerned about Poppy. I recommend taking him directly to a veterinarian. He may be quite ill and be too lethargic to move, or he may have injured his back - rabbits are very fragile and prone to back injuries. Be very careful lifting him and do your best not to move him around in case he does have an injury. Place him directly into a box or carrier with a towel in it so he doesn't slip around, and transport him to the nearest vet. Your vet will do an exam, and based on their findings may recommend bloodwork and/or x-rays to determine why he won't move or eat. I hope this helps, and I hope he feels better!