Hi Helly
I raised a pineapple plant from the top of the fruit. I put it into a rockwool block rather than compost as I find it easier to control the moisture level. Make sure you trim right back to the core as any of the flesh left behind will allow fungus in and my first attempt failed as a result.
As the article said patience is the key, mine took nearly two months before the first sign of root development. Choose your pineapple carefully as some of the larger ones have lethally sharp spines all down the leaves (well maybe not lethal but have drawn blood on several occasions).
Finally the warmer the better once the pineapple is established for growing it on, and careful not to overfeed.
Good luck
Richard