He has to make this happen on the inside. You cannot sign him up. If his parole hearing rests on him signing up, why are you asking and not him??
https://www.inmateaid.com/ask-the-inmate/the-parole-board-recently-denied-my-family-member-on-the-grounds-of-him-having-to#answer
Accepted Answer Date Created: November 16,2015