Fuji FinePix S3000, how to change the shutter speed.

Ok, I bought this nifty arse digital camera, a Fuji FinePix S3000. It's 3.2megapixel with a 6x optical zoom. It's also got a manual mode, although it's a half-*** manual mode. I plan on taking pictures of fast moving things but I can't figure out how to do it. Does anybody know how to change the ISO or shutter speed of this camera, or is there even a way?

It's got an Apperature Priority setting, what's that mean? The setting has three different settings, f2.8 f4.9 and f8.2. What do these mean and what do they do? I've noticed that when I change the apperature it gives me wierd numbers for the speed, like 1/2.8 or something like that. The fastest the camera can go is 1/1500 sec, how do i get that?

Thanks in advance!!!!