If it is temporary, wash your hair twice a day. Most of them are made to last 6 weeks of washing your hair every other day (21 washings), so you should see improvement in about 10 days (20 washings). If it is permanent, you will need professional help from a salon. The will have to strip that color off and then dye your hair its natural color. You can try getting it off yourself, but you might end up with an outlandish color of orange. (If you have the packaging from the dye you used, bring that with you to the salon.