How do you change oil on a 2005 Polaris 500 Sportsman quad?

inside the left tire there is a canister right under net there's a bolt u unscrew right below the dipstick let the oil out ,and right across from the canister to the motor there u will find a black filter and take off the filter n put on a new one! in order to do this u have to take the side panel off. hope this helps!