It’s really easy to limit the display of a popup to visitors that already saw at least 1, 2, 3… pages
1. Log in to your account
2. Create a popup or edit one that already exists
3. Go on the “Display rules” tab
4. Look for the sentence “Minimum page views before display” and select “2” if you want to start display on the second page view
5. Save

Now your popup will be displayed only to visitors who saw at least 2 pages (display on the second page and after).