Instructions tab in Mail merge
4. To start writing your email, just click on the second tab, labeled Email text . If you want to add custom fields in addition to the first and present names, just add double brackets << like this >> and make sure you spell the same fields in the same way when using it.
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Compose an email.
5. Next, switch to the third tab, Data to be merged , to add email addresses and other information. If you've added a new custom field like the one above, you'll need to enter them in the net above. Import or paste data into a spreadsheet.
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Merge data.
6. To see if it works, select Test Mail Merge from the Mail Merge menu (if not visible, try reloading the page).
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This returns the first 3 messages as a test if merge works. You will need to authorize the scripts the first time you use.
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7. If everything works fine, you can now choose Run Mail Merge from the Mail Merge menu so that the script does its magic. Good luck!