Change my plea from guilty to not guilty?

I doubt you could change your plea, it would just make you look more guilty, ya know? Better to just leave it as it is. Unless you had proof of your innocence, I don't know, but if your really innocent then I say thats bull sh*t to make you pay for something you didn't do, does your sister have the money, considering you said she was the one that got the ticket (technically) ?