There are two types of merge fields, recipient or sender, which populate with related information (like first name or address, for example). New merge fields are typically recipient fields by default.
Go to the Pages app sidebar, click the Document tab, then click Mail Merge.
Choose Add Merge Field, then choose the field you’d like to add from the list.
Note: To see the full list of fields from Contacts, click More Fields.
A merge field is added to your document. If you select existing text, the text content doesn’t change, but the selection converts to a merge field.
To add field options from a spreadsheet, see sidebar, click the Document tab, then click Mail Merge. Select the merge field you want to change, then do one of the following:
Change a Recipient field to a Sender field: Click the “Use as sender field” check box at the bottom of the Mail Merge options.
Change the information that populates in the field: on your Mac.
Open a document with an existing merge field, click Document Manage sender information in Pages on MacAdd, change, or delete a source file in Pages on Mac