To use the contraceptive sponge effectively, follow these steps: 1. Moisten the Sponge: Wet the sponge with water to activate the spermicide. 2. Insertion: Squeeze the sponge to make it smaller and insert it deep into the vagina, covering the cervix. 3. Timing: The sponge should be inserted up to 24 hours before intercourse and must remain in place for at least 6 hours after intercourse. Do not leave it in for more than 30 hours in total.