1. Sign in to your GoHighLevel account
2. Go to Settings -> Agency Settings
3. Find the Custom Javascript field and paste your Usetiful script there
Hint: You can find your Usetiful script after logging into your Usetiful account, behind the "Install to your site" button
GoHighLevel allows you to pass multiple attributes to Usetiful, such as Id, name or email. Feel free to pass them to Usetiful as tags or unique user ID.