Good to hear that you like it.
I have not made a post about that. A pretty good idea to make one.
It is not too complicated though. You need to have two hive accounts if you want to have two dcities.
Then from the dashboard within dcity.io you can go to the card that you want to send click the send button and then you send it to the other hive user.
Pretty much like you send normal hive-engine tokens to another account, if you’re familiar with that.