Yes, you will need to contact the father and have him sign over his rights. If he denies the request, you could get a lawyer... I don't imagine it would be difficult to get him to sign them over if he is incarcerated and will be for some time.
He signs over the rights, then your husband and you complete the adoption papers. I went through
Child Adoption | Step Parent Adoption | Domestic Adoption, they complete the paperwork for you, made it quite easy.
Best of luck!
Pamela