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This post sort of explains everything https://peakd.com/hive-174578/@acidyo/twitter-posh-upgrade-discussion-community-input-appreciated.

Basically, you just sign up on https://hiveposh.com/ & connect your Twitter/Hive accounts. Then anytime you tweet a Hive post link and use #Hive, you have a chance to earn some POSH. It depends how much engagement your tweet gets on Twitter as to how much POSH you will earn. The POSH will show up in your Hive-Engine wallet. Are you familiar with that wallet? You can find it in the wallet section of PeakD.