Log into 'Reviews.io' Dashboard
Reviews Set up >> Widget Library
Copy the code to your clipboard
Login into your Squarespace website and click on Website editor.
Go to the page you would like to edit and add a code block where you would like the widget to be displayed.
A code box will appear, this is where you should paste the widget code and click Apply.
Here's an example of the code from our Carousel Reviews Widget, which displays recent reviews automatically in a carousel which users can browse without leaving your site.
For compatibility reasons your widget will only displayed on your live site. Whilst in edit mode you will see the following: