The only way to really put pressure on your opponent is to keep advancing. Try to get your team moving the ball forward and past it's last position! This will get you behind your opponents defense and force them to turn and fall back. Kicking is the easiest way, but you risk losing possession (and if you are not holding the ball - you can't score!). This leaves you the other option - Moving with the ball. You can only move a limited number of spaces every turn, so try and make these count. The best way to do this is to try and run as straight as possible.