Here is a step-by-step guide to using your vocal cords without exhaling:
1. Close your mouth and hum to yourself.
2. Continue humming, but gradually decrease the amount of air you are pushing through your vocal folds.
3. Once you are humming very quietly, try to keep the vocal folds vibrating without pushing any more air through them.
4. If you are successful, you should feel a slight tingling sensation in your throat.
5. Continue to practice this technique until you are able to consistently use your vocal cords without exhaling.