Click "Create a new Account" and complete the registration form. How to fill out the Illinois Employment Security Registration Form?1. Gather your business and contact information. 2. Click "Create a New Account" and complete the registration form. Once your account is created, continue with the instructions below. How to fill out the Illinois Employee Registration Card Renewal Form? 1. Collect necessary personal information including license number and date of birth. 2. Every government is required to register with the Office of the Comptroller. We recommend completing your registration and account setup in one sitting. You should complete this form and give it to your employer on or before the date you start work.