Can I reject a potential tenant I already said yes to

[Rebecca Alofaituli]

I recently approved a tenant but still haven't received any of the cosigner information. He is also trying to get me agree to things that are not in the lease amd wants me to make addendums. I think he is going to he headache and I don't want to rent to him. Do I have a right to back out and how should I word it when speaking to him?