Open the Shopify App Store in the Shopify admin area and search for "Printlabs". Click "Install app" on the app page. On the "Install app" screen, review the requested permissions (data access to orders, products, customer data) and confirm the installation. After installation, you will be automatically redirected to the Printlabs setup to link your store with your Printlabs account.
The exact names and screens may vary slightly depending on the Shopify or app version — if in doubt, the explanatory video can help (see previous article).