Paste the snippet
Site-wide in one field.
Settings → Advanced → Code Injection
Copy your snippet
In your SiteMind dashboard, open Widget Studio and copy the embed code. It is one script tag with your widget key in it.
Open Code Injection
From your Squarespace dashboard, go to Settings → Advanced → Code Injection.
Paste into Footer
Paste the snippet into the Footer field (not Header).
Save
Click Save. The widget appears site-wide right away.