Answer:
There are four main ways to get heroin into your body: IV, Smoke, Snort, Rectal
If you're from The United States of America, depending on your location, east or west coast. Your heroin will vary. The east coast usually has heroin in powder form, usually a white-ish color. This heroin is generally better quality and more pure. Most people snort or IV east coast powder.
Now the west coast isn't as spoiled. We have to deal with Black Tar Heroin. Which is generally not as pure and worse for your body overall. Most people smoke (chase) tar off of foil with a pen or straw. Smoking heroin takes a lot of practice to get a good technique down so you aren't burning up your heroin and wasting money, which is why a lot of people don't like smoking as it's hard to master and you don't get as much bang for your buck. Although smoking heroin is the route of administration that hits you the fastest, IV second, and snorting third. You can also IV black tar heroin, as well as snort tar. Snorting tar is generally not the preferred way as it takes too much work to prepare and results aren't worthy.
You can also ingest heroin orally but your body absorbs so little of the drug this way it's considered a waste. Another popular method that's getting more attention is plugging. This is rectal administration of heroin.
(original answer) you can Inject it with a hypodermic needle, you can snort it, and you can smoke it....