Place the spermicide inside the diaphragm’s cup.
Separate the lips of the vulva and pinch the rim of the diaphragm to fold it in half (for easier insertion)
Push the diaphragm as far as it can go, with the dome facing down. Make sure it is snug as it covers the cervix.
Leave it for 6 hours after sexual intercourse. You should not leave it for longer than 24 hours.