You can add custom code to your site using the Squarespace Code Injection

First, copy the embed code from Reboo

In Reebo click on your Project to open it

At the top right, click the "Connect Reboo to your website" button

Click Copy to copy the embed code

Paste Embed Code to Squarespace

In the Home Menu, click Settings

Click Advanced

Then click Code Injection.

Paste the code into the Header box and click Save