What do I need first? It's essential that you bring the unsigned form, as you must sign your affidavit in the presence of the notary public.The UPS Store at 2506 N Clark St offers notary public services in Chicago, IL at your convenience. The person requesting this notarial act must personally appear before the notary and sign the document in the presence of the notary. Learn how to fill out an affidavit correctly with this comprehensive guide. Discover the steps, types, and when you might need an affidavit. My Commission Expires. Verify statements for legal matters and business transactions using our Illinois general affidavit form template. AFFIDAVIT. (Corporation, Partnership, Limited Liability Company, Association).