ok i downloaded some new tracks and skins but i dont know how to use them.. like i cant get the bike and gear that i downloaded and i cant ride the track i downloaded

ok i downloaded the tracks and skins and all that.. but how do i get them to work

THANKS

yea. im new to the game and i was wondering like how when you veiw replay or whatever, how do you get out of first pesron so you can see yourself.. I also need help on like where you go to get graphics and new tracks and all that.. ANY HELP WOULD BE AWESOME