1. Program mode, Assign screen.
--- SHIFT + 6 (or was it 9?

anyway it says PROGRAM on there) gets you to the screen where you choose your DRUM. If you don't know what this means just choose DRUM1 for now ( but you should read up on the DRUM/PROGRAM stuff, it's in the manual). Then you'll get to the assign screen, from here you can tap on any of the pads and assign sounds to them. From this screen press params and you get to tweak the filters and stuff like that.
2. You can do this from the assign screen. There's a (can't remember the actual name..) "playing mode" or something that is set to normal. Select SIMULT and you can choose two other pads to trigger when you hit the pad. There are other stuff there as well, but you'll have to find em out yourself.
Experiment!!!!