1. Download the Printful module for PrestaShop here
2. From your PrestaShop admin panel, go to Modules > Module Catalog > Upload a Module
3. Upload the Printful module .zip file and click Configure
4. Decide whether to create a new API key or use an existing one, and press Connect
5. Authorize the connection with your Printful credentials
6. Now Printful and PrestaShop are connected!
You can also watch this tutorial on how to set up your PrestaShop + Printful integration: