Step 1: Hold the head joint in your left hand and the middle joint in your right hand. Gently twist and insert the head joint into the middle joint. Make sure that the embouchure hole is directly in line with the middle joint's row of keys.
Step 2: Hold the assembled middle joint in your left hand and the foot joint in your right hand. Gently twist and insert the middle joint into the foot joint. The embouchure hole, keys of the middle joint and the long rod on the foot joint should all line up.
Step 3: Rest your left thumb on the underside's long straight key. Keep your wrist straight. Your fingers should arch naturally. Rest your fingertips on the center of the keys.
Step 4: Place the tip of your right thumb on the flute's underside between your first and second fingers. Arch your fingers and rest them lightly on the keys. Put your little finger on the E-flat key.
Step 5: Allow the embouchure plate to press lightly against your lower lip.