Use the plugin
Install the plugin
Download it, then go to Plugins → Add New → Upload Plugin and activate it.
Connect
In Open Tracked open Settings → CRM and automation and create the connection key. In WordPress open Settings → Open Tracked, paste it under Connection key, press Test connection and Save. One key connects everything.
You can also add Google Tag Manager container IDs in the same screen.
Or paste the snippet
Add it before </head> with a header-scripts plugin such as WPCode.
<script async src="https://app.opentracked.io/os.js?k=YOUR_SITE_KEY" data-key="YOUR_SITE_KEY" data-window="30"></script>Selling with WooCommerce? See Install on WooCommerce.