"how to be get inmate?" is confusing if you're talking about how to interact with other inmates press the "look around" button. When they are on your tile you'll see their name on the side and when you press the button their name will be there also.
Viewing post in Broken Dreams Correctional Center comments
if you're talking about how to make a inmate your friend just raise their affection score up to do that you have to chat with them find their likes and dislikes and use that info to raise their affection. Eventually a indicator will appear saying *name* has become your friend the only thing this really does is at times you might get helped out if for any reason you lose a fight or if you're a slave and your owner/victor is dragging you around somewhere you're friend might show up and help you. (if you want to be helped that is)
if you're talking about the story where you side with the guards and such i think that is still being worked on and the only way at the moment is to be the bad guy and side with your domme cat girl (you have to go through with her story to reach that point though) (story is still being worked on so even the bad route is not completely finished)