You press delete racer and it will ask you if you really want to delete it
you cant but you can unlock his stuff though
You have to pass all the other champions and when you reach him, I think you should get a lot of the speeds(green block) and get 3 whites. Try to get as many as him and you might win Rocket Racer....
um yes
Very few. You have to be a top competitor. usually with multiple titles and a loretta lyyns victory