If you use Mail merge on a Mac and are having problems, you've come to the correct spot. If your mail merge on Mac not working, select the tool menu and then the 'Start Mail Merge' option. Select the emails or letters you want to combine next, after which click "Select Recipients." Select and open the data source by clicking the "Use an Existing list" option. After combining the messages, use the variable and then click "Insert Merge Field." Select the appropriate column name, and then click "Preview Results." Click "Finish & Merge" now, then choose "Merge to Email." Combine the messages, then select your chosen method of sending the consolidated message. But the final step is to select "Mail Merge."