How can I buy car insurance?

Sorry, my real question is as follows:
My mom owns a car, and I want to drive the car and get it insured. I do not know if I can find an auto insurance agent and tell her or him that I want to insurance the car for myself alone, without paying insurance fees for my mom.
I just want to insurance my mother's car and drive it by myself without paying any premium fees of insuring both mom and I.
Any one has experience about that? Is it possible?