Add the tag in Site Settings → Code. The script is about 6 KB gzipped and loads asynchronously, so it won't hold up your pages.
Create a free account, then add your site in the dashboard. It shows the snippet below with your own tracking ID filled in; the ID here is only an example.
<script async src="https://api.thravic.com/tf.js" data-tracking-id="TF-1A2B3C4D"></script>Data appears within a few minutes of your first visitor. Form inputs are masked in the browser before anything is sent.
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