i'd also check it regular to make sure its not touching the diffuser while your driving as it will melt it pretty bad and you may need to adjust it before the weekend
as foxy says,undo the U bolt that fastens it to the centre section and adjust accordingly,you'll only be able to move it when the exhaust is stone cold and try not to go to far bud,a tiny alteration makes quite a difference at the tips
top tip,measure the gap between the tip and the diffuser on both sides to start with then remove the diffuser and measure the gap between each tip and the bumper,you can then work out how much it needs adjusting