Detach the lower joint from the upper joint of the clarinet.
Loosen the screw on the bottom of the clarinet lyre to make the ring larger.
Place the metal ring of the lyre around the metal rim at the top of the lower joint. Make sure that the lyre is pointing straight up so that you can easily read the flip folder while playing.
Tighten the lyre by turning the metal screw clockwise to create a secure fit.
Attach the upper joint to the clarinet. If you need to adjust the lyre further to prevent contact with the keys, do so by loosening the screw on the bottom of the lyre slightly and adjusting as necessary.