VISIT THE CHICAGO BOARD OF ELECTIONS WEBSITE FOR FULL DETAILS, REQUIREMENTS, AND THE APPLICATION. https://chicagoelections.gov/en/register-to-vote-change-of-address.html
NOTE, If you have not been registered previously, moved, changed your name or become a citizen you have to register before the election.
To verify your registration, find your polling place and your districts and view sample ballots, go to http://www.Chicagoelections.com.
Online Registration is available: It is possible to register to vote (or change your address) online in Illinois if:
The applicant has either an Illinois Driver's License or State ID.
The signature is used for the ballot application.
The applicant has a Social Security number
If the applicant supplies her/his email address (optional), Illinois election code requires election officials to provide this email information to campaign committees and political organizations.