You take a feather, and just above the thick part next to the stem take sally hansons and put it on the back side of the feather. You put it under the wire guard then press the blade into the slot and let it sit for a minute.
The one I have came with 3 blades but some came with 5 blades, I'd love to find the other 2!!!!
Pressing the blade
What they look like when done