The Crowdsale ended about a month ago, so there is no Qtum available. In September when the Main Network is released, people may offer to sell them to you.
This doesn't mean you cannot participate, the Test Network will be launched in June. You can request Qtum tokens if you would like to test a DAPP or Smart Contract. Even if you just want to stake some coins to see if it works, and see if you can find a bug in the code.