Transfer Ring Ownership

Hi all, I’m new to ring so go easy on me. I just moved into a new apartment and the previous tenant left behind two ring video doorbells; one in the front of the home and one in the back. Can anyone explain how to transfer ownership, if you will? What steps do I need to take to get access? Would prefer not to have to involve my building manager having to share the former tenants info or play middle man. Thanks!