The easiest way is to smoke it off foil like heroin. Get a square of foil about 5" * 5", kinda fold it into a V-ish shape to give it some strength. Next you'll need a toot which you can also make from foil: this time take your square and fold about 1/2" on each side then roll it around a pen or something so you've gotta tube. Get a lighter. Put the toot in your mouth and the crack on the foil and light underneath, tipping the foil so that the crack (which should be a clear / yellow liquid now) runs. You've got to suck up the smoke which needs a bit of practice. People don't like this way because the crack crackles and you can get it spitting and jumping (perhaps in your eye), however, it lasts longer. Remember, you'll have crack residue on the toot at the end so be sure to smoke that as well.
Here's a quick crack-pipe: you'll need foil again and a small jar and some ash and an elastic band. Put some foil over the open end of the jar and make it taught with the elastic band. It should look a little like a drum. Next poke some small holes in a small circle at the north part of the circle and then cut a small 'mouth' at the southern part. Place a 'bed' cigarette ash on the small holes and then break a bit of your crack on top of that ash. Put the 'mouth' of the circle to your mouth and then hold a lighter to the crack. Breathe in and hold letting the air out very slowly through your nose. Again you'll find residue building up inside the jar which you can scrape off and reuse.
Crack is very addictive for some people, though not all. It's worse than heroin because there is no upper limit to the amount you can spend on crack whereas heroin does have a limit even though it might be high.
Crack is over-rated, don't believe the hype!