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Navigate to Dashboard > Appearance > Theme editor.
Find the Theme Footer.
Add the script reference as follows:
For Proactive Chat V1.0:
Code Block <script type="text/javascript" src="https://pop0-apps.mycontactcenter.net/webchatscripts/telaxdemo10/icr/0e8af7f4-82dc-44d5-a557-b49ae49a49da/icr.js"></script>
For Proactive Chat V2.0, copy the Proactive URL as shown in Proactive Chat v2.0
The image below shows an example.
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Chat for one Particular Page
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Navigate to Pages, edit the target page, and add a Custom HTML block.
Paste the script tag, and then click Publish.
For Proactive Chat V1.0, copy as shown in the image below.
For Proactive Chat V2.0, copy the Proactive URL as shown in Proactive Chat v2.0