1. Have a Google Spreadsheet with the usernames you want to tag. [using a Google Form?]
2. Don't forget to make sure the Google Spreadsheet has a link that allows anyone with the link to view it, at least. [how?]
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No data you enter here concerning your sheet or the content of it is recorded in any way. All this does is interact with Google Sheets and format the result, all in your browser. That being said, page views/analytics are tracked by Google Analytics.