There is no longer a private content password. We now use the industry standard method of unlocking and locking content individually, for a specific person. To unlock all your private content, either click the Unlock button at the top of his profile
or open a message to him (to the right of unlock above, or via messages in the main menu, if you have already communicated) and click the Unlock link, bottom left
Once clicked both these icons will change to an open padlock, and the text will change to 'Lock'. Click it again to re-lock your private content for that person.
Private pics can be sent individually, in a message. Click Attach Pic
and a popup will appear, showing all your private pics (I made one pic private for testing).
Tick the pics you want to send, and click 'attach selected photos'.
The relevant item(s) will then appear in the conversation
PLEASE be aware, that although anyone can re-lock unlocked private content, only supporters can unsend a sent message containing a private pic.