did you have them on feb. 28th? if so, then you import the wallet into btsx to claim bitshares. bitshares were handed out to people who were holding on that date. future DACs will work that way too (if you choose to hang on to your PTS), just look out for "snapshot dates."
if you were holding them on the last day of may you also got lottoshares out of them.
if you didn't have any pts on feb 28th, then you would have to buy Bitshares from bter.com or trade with somebody to get them, since the product is out now.