Hi,
Just follow instructions. Pay online fee ($490), if you had not paid upfront. It will generate a e-receipt. Save it as PDF on your computer. Now, open CSE link. Fill out required info. Upload e-receipt.
One thing I was not sure here was about type of application to select in Case Spec Enquiry. Nothing really is relevant for us. So I chose PNP outland, after reading and searching many threads.
;D That's the closest.
Good Luck!!!