In the picture i put a white piece of paper that is positioned where the maget should be .. I just took a piece of electric tape and taped the dime size piece of magnet underneath where the the credit card slots are .. (Obviously dont tape it on top of the credit card slots). The screen is very sensitive to it and recognizes it very easily ..I would use the least powerful magnet you can get away with so it doesnt cause any damage to your credit cards or draw object towards your phone that might damage it.
You can test where the magnet needs to touch when the case folds before taping it .. Its about a half inch into the screen from the volume down button..
If this helps only one person then i will be satisfied ..