Log in to your Squarespace account, then select Settings in the sidebar menu.
Click on Advanced.
Click on Code Injection.
Paste your embed code in the footer and press save.
You can find your embed code by logging into your Natterly account, and creating a new site.
Verify everything has been set up correctly. In order for the chat box to appear, you need to have at least one user Online, and in a department associated with the site.