To unlock the new badge, all you have to do is follow the NHL on foursquare and then mentioning your favorite NHL playoff team in a check in during the postseason. You will then earn your badge and see the following message:
Get ready for the most intense, heart stopping hockey action of the year – the Stanley Cup Playoffs! Because you have to see it to believe it. Because it’s the Cup.
Enjoy the new badge and Go Bruins!