I do not understand how renewals work. I have set up

I do not understand how renewals work. I have set up a subscription that expires tomorrow. When I go to my subscriptions, the only thing I see is the fact that I have a current subscription that I can unsubscribe from.

I want to have it so that a user's subscription that is about to expire sees a renewal button on their subscription form. I never want the user to see an unsubscribe button.

1) what is the renewal process when the sub type is finite?
2) how do I get rid of the unsubscribe button?

Steve