Hi Vicky,
Relax
No biggie,
Pre heat your oven to 350f.
Finely grate your parmesan (be sure not to use the rind, this will be tough)
Lay a thin (lacey)layer of the cheese on a sheet pan.
Make sure before you cook the cheese that you have everything you need to make your tuiles as soon as you pull the cheese.
(another words, your molds)
Bake the cheese until it starts to bubble and turn golden brown, at this time pull it from the oven, using an off-set spatula, gently release the cheese to a cutting board, cut your rounds or squares and put them on the mold and gently push them down to form your tuiles.
Let them cool and harden, and keep in a cool, DRY place.
Hope this helps and good luck
cc