Go to https://apps.shopify.com/gelato-print-on-demand and install the Gelato: Print on demand app for free.

Open the Gelato app from Shopify and log in to your existing Gelato account or create a new account for free to confirm the connection.

Your connected stores are visible from the Stores menu on the left.

Once your store is connected, you can create products in Gelato and add them to your store. If you already have existing products in your store, you can move them to Gelato.