Use the search engine, this has been answered many times.. but:
If you want to wear it, I forget the best place to put it.. I think the back is a good place, or under your arm on you bicep. If you apply heat to it, with a heating pad or something, it will absorb quicker.
You can also cut the patch into strips and eat them, or if you have the gel ones suck the gel out or smoke the gel.
Those last ways I mentioned though can be VERY dangerous. Fentanyl is a very powerful CNS depressant.. Your breathing will slow way down before you get way high, if that makes sense. So please please, be very careful with those things.