This specific lining and snap was for Sadie's owl bag. (last day to enter the Pattern Play giveaway!)
a set of magnetic snaps (if you don't have these this tute is kind of pointless) You can get them online or at Joanns.
small square scraps of felt
lining of your bag
First make two marks on your lining in the center, and about 1" from the top, equal to the spacing of the two tines of the magnetic snaps. Then cut two small slits with your scissors at these spots.
Push the tines of one piece of your magnetic snap through the two slits.
The back. (stunning photography, eh?)
Then cut out a small square of felt and cut slits in that too, and slip over the tines as well. (I don't know if I'm calling those things the right name. oh well!)
Also put the little metal piece that comes with it over the tines.
Then simply use the metal part of your scissors to push the two tines over to the sides. (edit: or to the middle, as one reader mentioned might be stronger...your preference!)
Repeat for the other side and you're done!
Well la-dee-freaking dah. You're donezo with this part! Continue sewing up your bag and enjoy your fabulous magnetism.