(1) You need to put your cursor in the message body to activate the Quick Parts feature in the Ribbon. In our case, we select the AutoText of Kutools for Outlook. Step 2: In the Message window, click the Insert > Quick Parts > AutoText, and then click the AutoText name that you will edit later.

This method will guide you to edit and redefine an existing AutoText in Microsoft Outlook with its AutoText feature.

Edit AutoText (quick parts) with AutoText feature in Outlook