To add a product to your Squarespace e-commerce store, you'll need to follow these steps:
Log in to your Squarespace account.
Click on the "Commerce" button on the left-hand sidebar of the dashboard.
Select "Products" from the menu.
Click on the "Add Product" button.
Enter the product details, such as the name, description, price, and image.
Select the product type, and add options, such as size or color, if necessary.
Assign the product to a collection and set the inventory if you wish to track it.
Click "Save" to add the product to your store.
You can also add products in bulk using a CSV file; this option allows you to add multiple products simultaneously. You can also customize the product page by adding a product video or product tags or using the product options feature to allow customers to customize their products.