Illinois Statutes § 5/19A-45 Certification

The voter shall make and subscribe the certification provided for on the return envelope of the ballot, and the ballot or ballots shall be folded by the voter in the manner required to be folded before depositing the ballot in the ballot box, and shall be deposited in the envelope and the envelope securely sealed. The voter shall then endorse his or her certificate on the back of the envelope and the envelope shall be returned to the election judge or official conducting the early voting.