How to Mail Merge Address Labels Using Excel and Word Open Word and go to "Tools/Letters" and "Mailings/Mail Merge". If the Task Pane is not open on the right side of the screen, go to View/Task Pane and click on it. The Task Pane should appear. 4 Fill the Labels radio button In the Task Pane. 5 Click on Label Options and choose the label you are using from the list. Click OK once you have chosen. 6