Here is how Illinois voters may register to vote 
(1) online, (2) by mail, or (3) in person during Early Voting or at the precinct polling place on Election Day. 

This video offers tips for voters who are registering for the first time -- or who are filing an address change or a name change. The video includes information on forms of identification needed to register.
Oneline: Use your IL driver's license or state ID card to register to vote or to change your name or address.   Deadline: 11:59 pm, Sunday., Oct. 18th