You have made a commitment to your Adjustment choice so if you no longer want to attend the course you should contact the university or college to discuss your situation. As soon as you were accepted at your Adjustment choice, your original UF choice would have been informed - this means that the place is no longer held for you, so you will need to contact them to see if they can still offer you the place. If your Adjustment choice agree to withdraw your offer, you will be entered into Clearing - if your original choice can still offer you a place, they can make you an offer in Clearing.