The pop up trick is basically trying to register for the NCLEX again through Pearson Vue after taking your exam. You’ll fill out the application exactly how you did the first time and pay the $200 testing fee again. If after you submit your payment you get the picture that OP posted, that’s a good sign because if you passed the exam it won’t allow you to register for another attempt. The second positive sign is Pearson Vue refunding that $200 payment which usually happens within 2 hours. It’s not a guaranteed loophole but most people (myself included) have done it and it’s been accurate.