WordPress sites are best tagged by adding the Effective Measure tracking tag to the footer.php file.
Open the footer.php file in your preferred text editor and paste the Effective Measure tag into the file just above the </body> tag. It's very important the code is place above the </body> tag or it may not function correctly. After pasting the code and saving the file open the WordPress site in a web browser and view the page source. The Effective Measure code that has just been copied should be visible near the bottom of the source code file.