Remove the tape-core rewind gear of the old tape. (Leave the drive-gear and the tip as they are.) Hold the refill cartridge (Leave it in the holder) over the body . The tape side of the cartridge should be faced down. (Please be careful that the tape does not catch the tip.) While tightly holding (1) part of the board, remove the holder by grasping (2) party of the holder. The board should be removed. Press the core lightly and wind the rewind gear in the direction of the arrow until white tape appears at very end of the tip. Close the upper cover and set the lock in the LOCK position and proceed with use