You can do so for free once a year by calling 877-322-8228. It is a lot simpler and quicker than jumping through all the hoops on the internet and you do not risk mistakenly agreeing to waive your right to a jury trial by arbitration. Please be sure to stay on the line until you have ordered all three reports.
The three major credit reporting agencies Experian, Equifax and TransUnion must, by federal law, give each debtor one free credit report per year. You can use your favorite search engine and contact each of them directly and request your one (1) free credit report once every year.