Originally Posted by Raee

It's the same website you check your status on....
http://www.uscis.gov/portal/site/uscis
Then click on the "sign up for case updates" link....
"Register as an applicant costumer"...
Fill in the boxes with your info....
I've you're done doing that....
I believe it's the create portfolio link...
Type your receipt #....
You're done!