Here are the instructions to file a witness slip:

Before beginning, we recommend clicking the "log on" button on the very top right to create an account. While you don't have to do this, it will enable you to view or edit any slips you enter at a later time.

Under Section I. Identification, input your address or information. If you are filing as an individual, put your home address. If you are affiliated with an organization, but not authorized to represent it, you might include the information under "firm/business."
Under Section II. Representation, it is recommended that you enter "self" or NA, unless you are authorized to represent an organization.
Under Section III. Position, be sure to click either "Proponent" or "Opponent" as applicable to that bill.
Under Section IV. ?Testimony, click "Record of Appearance Only."

Then please click "Create (Slip)" located at the bottom right corner.

You may see a box that you will have to check saying that you agree to ILGA's Terms of Agreement in the bottom left corner. You may also see a Captcha system to prove you are not a bot once you click on "Create (Slip)"