815 ILCS 640/1
Any person who makes an agreement with any other person to represent him in his claim for settlement of a personal injury claim within 5 days after the occurrence which gave rise to the claim may, within a 10 day period after the occurrence elect to avoid the agreement by notifying the other person in writing of the election by registered or certified mail, return receipt requested.
The person undertaking the representation of the injured party by such an agreement must, at the time of the agreement, furnish the party with whom the agreement is made a copy of the agreement and the address to which the notice may be sent and a copy of this Act, and obtain written acknowledgement of receipt of such from the party represented. If he fails to do so, the 10 day period provided for in this Act does not commence to run until the agreement, address and a copy of this Act are furnished.
815 ILCS 640/1