After hitting Submit in the Report Link screen, I got the Thanks for the Feedback screen with the options to Go Back to the Form, Create My Own Form, or Contact Support. But no where was there an exit or close button. I had to use my browser's back button to escape.
Most of the browsers today use tabs which you can close easily without closing the whole browser. I am sure most of the browsers these days have it on them (even IE does). I never had this problem because I always saw the 'X' when I submitted any reports. I hope this helped.
I have no real solution, but I have found that refreshing is more helpful than navigating back and forth because of that annoying page. The result is that you're on the page you were on, but without the annoying screen because you took the time to report something.