Step 1
Login to your Google Tag Manager account, and click “New Tag”.
Then you will see the following screen:
Step 2
Click on the name to change it from “Untitled Tag” to “Poptin Tag”.
Now click on the second triangle called “Triggering” and select “All Pages”.
This is how your screen should look after that:
Step 3
Click on the upper triangle called “Tag Configuration” and select “Custom HTML”
Then paste your Poptin account code here:
Don’t forget to click “PUBLISH”. 🙂