Everything you always wanted to know about embroidery (but were afraid to ask) can be found here. Thank you fellow embroidery fanatics!!!
Hier are 2 photos to help you. I put a magnet on the back and you can clip notes in the peg. The second shows you the back of the cat. You cut a slit in the back material and slide the cloth peg in it. You can glue it if you wish.
here are some answers too :)
see link below, it explains it.