1. Copy the first 2 rows on your spreadsheet.
These 2 rows will include header columns for your G Merge Plus and data for one Mail Merge
2. Paste these 2 lines to another tab on your spreadsheet.
3. Add your Email address to the recipient field and run G Merge with your settings on this test tab.
G Merge will run on the tab open on your screen
4. Check the email account you set as a receipient to see if your merge works as designed and/or looks how you want it to appear.