The taking of an acknowledgment consists of positively identifying the signer of a document. An acknowledgment is one of the most common types of notarial acts, but it often confuses Notaries.Here are 5 steps to performing an acknowledgment. An Illinois notary acknowledgment form certifies the authenticity of signatures inscribed on a legal document. This article and video will show Notaries to fill out each part of a notarial certificate, and common mistakes to avoid. An Illinois notary acknowledgment form is a written authentication from a notary that the signature on a document belongs to the signer. This 5-step guide will teach you how to notarize a document that requires an acknowledgement (the most common notarial act). How to fill out the Notary Acknowledgement Forms and Instructions? 1. Gather required personal details. 2. Form must be notarized.