Adding widget code below global navigation on a specific page

Site URL: http://www.club21.ca

Hi there, I'm trying to add custom code for a widget from MindBody to my site on a specific page (currently using Squarespace 7.1). There's no information available online on how to do this without it going directly into the header, whereas I want the widget below the header — essentially in the body of the page. 

Let me know if anyone can help! Thanks in advance. ☺️

Hi,

Under navigation or under button?

You can edit page >> Add a Code Block >> Paste the code >> Then share page url >> We will try some code to move it under navigation