How do I check free credit report I am entitled to?

I just tried by logging on to the free credit report link. I filled everything out but then they asked me to pay. The problem is I do not want to pay for my "free" report. How can I still get my free credit report?

if you are looking for the free credit score and report usa national site, check out this site

http://free-credit-report-national.com/

Here you can check your 3-in-1 Report from all three credit reporting agencies and your credit score rating.