The Set Up T4 Summary Form window enables you to enter information, including a company contact person and establishment number, on T4 Summary.This field displays the name and address of your business. If you want to edit these details, click the zoom arrow next to the field.Enter the name, telephone number, fax number, and email address of the contact person you want to appear on your T4 Summary form.Enter the name, telephone number, fax number, and email address of the contact person you want to appear on your T4 Summary form.