Sure you could just edit the template perhaps and put the jse code snippet in the footer.php file.
Go to your admin dashboard then Appearance » Editor
You should see a file called Theme Footer (footer.php) edit this.
Paste the JSE code snippet just above the closing </body> tag at the bottom of the template file and then click save.
Check it works by visiting your site and opening a web developer console in Chrome with CTRL + SHIFT + J or in Firefox CTRL + SHIFT + K. After 15 seconds on your site you should see blockchain hash data coming in and being logged inside the developer console.
Any problems let me know and our team are here to help.