The Mailings tab on the Ribbon is where you can perform a mail merge by using these four groups:
Start Mail Merge
This is the beginning point where you pick a document type and then select, create, or edit the recipient list.
Write & Insert Fields
Here's where you can insert the fields and if necessary map your fields to your recipient list.
View the individual merged documents before you complete the merge.
Complete the merge and combine your individual documents into one comprehensive document, or print them out, or send electronically.
You begin with the Start Mail Merge command and then progress to the right across the Ribbon to complete the mail merge at the Finish group.