Go to Mailings Start Mail Merge Envelopes. Select a Mail Merge from the pulldown and click Continue. Microsoft Office Tutorials Insert Mail Merge Fields Choose the type of data source you want to use for the mail merge and then select Next. . Add and format the fields you want to be included in the email message and choose OK. Next select Send a Mail Merge from the Actions area. To insert merge fields on an envelope label email message or letter. Click HOME and then check the font and font size. Normally the document opens in Word with the Mailings tab selected ready for you to choose the merge fields. Press Alt F9 so you can see the field codes. This can be Date Currency Percent or some other field. Next click Step 2. Select the Insert Merge Field option from the dropdown menu to insert merge fields. In the Envelope dialog box under Return Address choose an option. Click Address Fields to