How do i Turn back my jeeps odometer?

hi i have 180 miles left to do for my insurence and then i have to pay again iv just had to pay �160 on top if i go over again i will have to pay �300 so i need to turn it back like 3000miles as i have 6 mths left till my new milage so can any one help me please i have a 1992 j reg pajero automatic hlp me please any help will be grat