It is not a pop up...it's a redirect to another page. The entire QB page redirects to the "other" page. (i.e., this page turns into that page...entirely) If you hit the back button, you go back to QB and then right back to the advertiser again. The only way out is to close the browser altogether and then open it again.
I know how to do a screen shot, there's just no point in this case. It would simply be the web page of the advertiser. I don't know how else to explain that.