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The Crease cartridge is black and is labeled in the software with a Crease icon.

Make sure the Head and foot block are already in the Aligned position. Click the Align Head button if necessary.  

Push blade cartridge release down to eject the current blade cartridge.

Turn Crease cartridge over and reinsert into the head with the notch on the back of the cartridge facing the head, until it clicks into place.

It can only be inserted one way.