To install Frontuser SMART code on your Wordpress site, copy your website SMART code and follow below steps:
Login into your Wordpress Admin site.
Navigate to Appearance → Editor, Left navigation menu.
Open Header (header.php) file from the right side bar.
Add your SMART code above </head> tag, and save the changes.
Your SMART code is now installed.
If your website uses any third party cache plugin, you need to clear your cache before ensuring Frontuser service.