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You can add query strings to the URL of the homepage in Wordpress by following these steps:

1. Log in to your Wordpress admin panel.
2. Go to "Appearance" and click on "Editor".
3. Find "header.php" file and click on it. If you can't find this file, you can use FTP to access it.
4. Add the following code to the top of the file, right after the opening PHP tag:

1. Save the file and go to your homepage URL. You can add any query string to the URL to test if it works.

Note: This is a custom solution that may not work for everyone. If you are not comfortable with editing code, you should consult a developer or use a plugin to achieve this functionality.