Louise, if you are just looking for a temperory display, go ahead and follow the instructions that came with it. If you want to grow, and rebloom this orchid, you will have to do some investigating. I bought one like that and immediatly repotted it! You need to take the moss out and see what is in that plastic sleeve. If it is in a bark mix you can just put the sleeve in a pot with a drain hole and return the moss UNTIL it is thru blooming. Then you will need to repot in a slightly larger pot. If it has spagnum moss in the sleeve, repot now, and say a little prayer over it. I have got several of those Phals that are doing fine, but the pot has a drainage hole and I can carefully pour water through them, but they are in a bark mix. I will still repot as soon as they finish blooming. The one that was in spagnum, and repotted immediatly, was getting a new bloom spike, until I broke it off while watering a couple of days ago. Aghhh!
As Kathy says, look at those videos. They are helpful.