New router

I have trouble with my doorbell since having a new router installed. I couldn’t find a way to put in a new wifi password so I deleted the Ring app and started again. However it recognised my e mail saying it was already in use! So, I used my husbands e mail and continued installing. However upon scanning the bar code part of the process I had as message saying the device was registered to someone else and it can take 15 days for the switch to a different owner to take place. I’m now totally fed up and confused and have no working doorbell! HELP.