@brownpaperwrap, thanks for the questions.

happy to report being follower #534.

Very glad to hear this.

#1 How and where to buy PORND? BitShares the only place, so we have to register there? Or can one buy them on Blocktrades?

You can go to this link to purchase PornD.

#2 So you'll be paying the dividend in Steem or PORND?

The payout is in BitShares (BTS)

#3 Where does the payout go? Steem wallets or BitShares wallets? Do we need to open up a BitShares account to get the dividends?

The payout will go to your BitShares wallet. Yes, you'll need a bitshares account which seems you've gotten now. Feel free to stop into our discord.