ok when i bought some songs from the itunes store, i clicked on the purchased music, tryed to sync in it, and it said something about an anauthorized computer and it wont sync on my ipod, plz help, its almost my bed time

p.s.IF U TELL ME ABOUT A WEBSITE WHERE U CAN GET A FREE IPOD, I WILL BLOCK U BECAUSE IM SICK OF IT AND IT DOSNT ANSWER MY QUESTION