Select Add-ons in the left bar of the menu of your back office and in the catalogue you will find the Squarespace add-on.
Click on the "More informations" button and then click on the green "Free" button on top right to activate the add-on and add it in the list of your connectors.
2. Setup of the Squarespace section
Select App and in the Sections menu click on "Add a section".
Select the connector and then enter a title for your section (1).
After in settings fill the website url of your Squarespace website http://www.mywebsite.com (2).
Click on "Add"'(3).
Your section is now ready.