Navigate to the Edit Website Design screen of the desired property or agent website. Then click the + Add Section button.
From the Add Sections menu click to add an Embed Code section.
Click to Edit the newly added Embed Code section (if it doesn't automatically take you there after adding it).
Edit the Top Navigation bar link for your new section.
Then click the Customize button.
Edit the section title as desired.
Click the Add Embed code link
Paste the Embed Code you got from the third party into the pop-up text area and then Save Changes.
If the embedded content isn't centered you can wrap the embed code in the HTML below to fix.
<div style="width:fit-content;margin-inline:auto;">
Your embed code inside here
</div>