The Blade Refresher is a method of refreshing the edge on your Penny Shaver (or any other cartridge razor, really)
1. Place some shaving cream/soap/lather on the Blade fresher
2. Stroke the razor BACKWARDS (i.e. the opposite way of how you'd typically use the razor, you're not trying to cut the refresher!)on the lathered blade refresh 3-5 times.
3. Clean off, and use your razor with refreshed blade!