Becky, you put it on a candle warmer (Not a mug warmer, those get too hot), and it melts all the wax. It smells stronger than a regular candle because all the wax is melted instead of a little bit. And no flame, so they're safer for families with kids/pets/etc.
The wax stays, the fragrance goes When the fragrance is gone, you can either toss the whole thing (when solid again), or use the leftover wax for fire starters. I'm going to try that when some of my testers are done.