The second time you click on the web viewer, the interstitial ad will Show. How do I do that?

When I go to the webviewer 2 steps forward in a webviewer app, it will show an intersitial ad once. How do I do that?

What have you tried yet?

You can make a variable called count as 0

When webviewer.back count=count+1
And if count>1 then show interstitial ad and count=0