Go ahead make fun of me
NEWB****
Yes, reading the manual is the first thing you should do. Fotojack was on the right track but his method isn't the way to change aperture in Manual. There is a pair of smaller buttons by the shutter button, you press the one farthest right (closest to edge of camera) and turn the thumb-dial. Turning it left will open up your aperture (lower number/f-stop, shallower DoF) and turning it right will close your aperture (higher number/f-stop, deeper DoF).