First go to your Gelato account, in the left-hand side menu, select Stores and choose the store you want to work with. Then find the product you want to connect and click on Connect Product. By connecting a product you are configuring it to be fulfilled via Gelato.

If there is a particular variant that you do not wish to connect, you can click 'Ignore'

After clicking Connect Product you will be directed to our Product Catalog so you can select to which Gelato product you want to connect that particular variant. You will be able to choose the exact format and other product characteristics.

Once you select the product, you'll be directed to our Editor. On the left-hand side, you can see all the design options you have (to upload your images go to Files). You can have different variations of the design per variant (you can see the variants on the right). Once you are done editing click on the top right corner Continue to Mockups.

Select the mockup for your product. Once done, click on the top right corner Continue to Connect.

Connecting the product/variant. Here you can see an overview and select the items you want to connect.

The final step is adding the prices. When done, just click on the top right corner and Publish the product.

You should see a confirmation as shown below: