Install through the Shopify App Store.
Steps:
Log in to the Shopify App Store.
Search for the ESTS PrintIt Product PDF app and click on it.
On the app listing page, click Add app.
In your Shopify admin, authorize the use of the app by clicking Install app.
After that, a billing page will open. You must purchase the plan before opening the app. Click Approve to complete the purchase.
Click Open app to launch the ESTS PrintIt Product PDF app. It will appear as shown below.
You have successfully completed the app installation and setup process.
You have successfully complete the app Installation and setup process.
Click on the Customize option as highlighted in the screenshot below.
Click on the Save button located in the top-right corner of the screen.
Click on the “Save” button which is placed at top right corner of screen.
Congratulations! You have successfully set everything up. You are now ready to use the app.