To use a magnet page, begin by printing off the worksheet. Purchase circular Expo Brand whiteboard magnets. I have seen them at Sam's Club, sometimes packaged with push pins, or on EBay. Have the children put the paper on a cookie sheet. I recommend the Bakers Secret brand one that is 9x13. Have the children complete the picture by putting a magnet in each circle. Some people use pompoms or bingo markers with them. This activity is designed to promote one to one correspondence and letter recognition. If you have older kids, these magnets can also be used with the Magnet Mosaics.
Amazon now carries circular magnets that will work with magnet pages.
Some people use stickers too.