How can I sell my unregistered car when it's never been registered in my name?

I recently purchased a car and the previous owner signed the car over to me. However, due to mechanical issues, I am not going to be able to register the car. The registrations been expired over 6 months now. I want to sell it to a junk yard for some cash but i need to do a title transfer. Is there a way for me to sign the car over to them when I was never the registered owner? please help!!