Step 1. Click "Setup" on the Admin Dashboard.
Step 2. Under Set up Software, click the link saying "I want to get code to insert on my thank you page".
Step 3. Select the shopping cart as "Squarespace" and copy the code given.
Step 4. Login into your Squarespace shopping cart.
Step 5. Under Website option, click on your site.
Step 6. Getting into the site option, click on "Settings".
Step 7. Under Settings -> Website, click on "Advanced".
Step 8. Under Advanced, click on "Code Injection".
Step 9. Scroll down to Order Confirmation Page option and paste the Code you copied from the Dashboard and click "Save" at the top.