How to show an Onsite Form to visitors that have browsed a specific number of pages

1. First, you need to create a form. If you haven't already, check this article. You can also select one existing form, by clicking on the Campaigns tab from the main menu and then clicking on the form that you want.

2. From the Editor view, click on the Visibility tab, as shown in the picture.

3. From the Visibility view, you can also set your form's trigger, frequency and targeting. 

4. From the Browsing rules, click on the Number of pages visited box.

5. After clicking, click the toggle button to enable the rule and type the least number of pages a visitor should have visited, in order to see the form. You can also decrease or increase the number by clicking the minus or plus icons. 

6. Don't forget to click on the Save button to save your progress.