You must be playing down the pitch for this cheat to work.

     If  the  opposition  scores  a  goal,  wait  until  your number 9
prepares  to  kick  off  again,  press down, right, fire and then hold
down.  As  the  ball reaches the oppostions number 2, he will pass the
ball  to  the  keeper, who will miss the ball, thus an own goal b eing
scored.