Hi MAryZ!
I just want to make sure you have all the info you need to grow your flytrap now, so I am going to post some basic care instruction, and info.
First off, go ahead and leave it in the pot it came in for now, maybe next year you can move it, but that one is fine for now.
Place the pot in a saucer, and put a tiny bit of water in the saucer, if in doors, I think about 1/10th of the pot should be covered, i.e. 9/10ths above water. The water should be distilled, or Reverse Osmosis, otherwise PURE. No tap water, Chlorine may seep out, minerals DONT. Tap water is death in large amounts. As far as you misting it with tap, it will probably be fine... just pretend it never happened. (Softened water has salt in it, and salt is instant death to carnivores!) (Well.. not instant... but pretty quick) media should be damp to the touch, not soggy... soggy media means rotting roots. The day the saucer goes dry, is the day you add more water.
OK... on with the show...
sunlight should be bright, and filtered, where you live, a southern facing window would be ideal, in the summer, it will do fine outside I think.
OK, feeding...
I am actually amazed that the flytrap didn't open back up when you put the hamburger meat in... you see, there are three little trigger hairs on each lobe of the trap... when disturbed, the trap closes... but in nature, a raindrop could cause it to close, so flytraps have to sense continued struggle of their prey, i.e. it has to be alive, for it to continue closing tightly around the insect... did you massage the traps after putting the meat in? Sorry NG, but I disaggree, live insects only for beginners... she has a son, so I am sure if she doesn't like picking up creepy crawlies, he wont! As I said, live food keeps the trap interested and moves it towards digestion... not only that, if you have used any form of pesticide, and that insect is dead because of it, then that pesticide is going into your plant.
I reccomend not feeding it at all, as it does not need it. It will catch what it needs later in the summer. (I know it's not fun! but it's better for the plant!)
Traps are good for up to three or four closures... every subsequent closure, the hinge of the trap grows it back open, and the added tissue makes it slower and slower...
hmm... I am sure I am forgetting a ton of stuff... but I hope what I have said is helpfull and informative...
Oh... and don't feel bad, if some one pops in here, and tells me they have never lost a flytrap, especially their first one, 9 times out of 10 they are a liar! I have killed far more than my fair share!
Besides, your son learned something from it, and while I may draw a bit of criticism, I think the experience far outweighed any negative side effects, even it the plant dies, your child LEARNED something, and that is terribly important!
I hope your VFT survives the hamburger incident. Its a common mistake because people will tell you to feed them hamburger. And tap water is also an easy mistake. In the summer, you can put the plant outside and it will feed itself with no problem. Mine stayed full of flies! And the rain will be good for it. If its a dry spell, you can pick up distilled water at the grocery store. If you need to replace your plant (or want to try some different ones...like a Red Dragon or Dente), Phil and Jeff here at Exotic Gardens can provide nice, healthy plants and care sheets for you.