Simply unscrew the chrome end, push out the inside shaft (holding the old tip) from the Bamboo sleeve.
Insert this new Replacement Tip into the Bamboo sleeve, and screw back on the chrome end.
If you already own a Crystal Katana, and need to replace the tip, this will do the trick. With practice your tip should last you thousands and thousands of crystal placements - but sometimes, you just might need a new one.