Photoshop CS3 help with tips and tricks?

You can go to Image>Adjustments>Brightness/Contrast. Adjust it from there. If you want to, you can adjust it by going to Image>Adjustments>Levels. It's all easy once you know where to go and how bright you want it to be. I dunno how dark your pic is so I couldnt tell you the exact numbers to put it. CS3 isnt that hard though. If you want, there are plenty of Photoshop tutorials out there. Just google photoshop tutorials and you'll find PLENTY of interesting ones.