Step 1
Navigate to your Webflow Dashboard page and select your website
Step 2
Locate the Webflow Icon in the top left hand side of the page, click and select Project Settings.
Step 3
In setting there should be an option for Custom Code
Step 4
Copy the Happierleads script and paste it in the Head Code box. Click Save Changes and don't forget to publish your site to make these changes active.
Step 5
Return to the Happierleads settings page and verify the installation.
https://youtu.be/rcA_Kh9Tk6w