Saddle position is very important. Having it in the right position will reduce fatigue, soreness, and reduce the chance of injury on your ride.
Saddle position comes down to three different adjustments: angle, height, and for/aft positioning.
Adjusting the saddle angle is simple. You will need an allen key to undo the one or two bolt design. Adjust the saddle so it is as close to flat as possible.
In adjusting the height of your seat, you will want to ride with the saddle at the actual length of your leg. To do this, you will want to put your heels on the pedal. You can then raise the saddle to the highest point until your hip begin to rock while pedaling backwards.
In order to adjust the for/aft position of the saddle, you will need a plumb line. This can be made by tying a small weight to a string. Using the same bolt you used to adjust the angle of the saddle, you can use to slide the saddle forward and back on its rails. While your pedals are level, hold the string at the end of the femur and behind the knee cap on your leg. Line up the plumb line so it falls straight down through the axle of the pedal.
After making these three basic adjustments you should have a good basis for starting.