I posted this in another thread, but if we are putting usage tips here, I'll add this one.
Private conversations replaces private messages. You can find this via the Inbox link at the top right corner of the forum. If you want to start a conversation with another member, though, there is an easier shortcut: click their avatar or username. This opens up the member card. You'll see there is a link to start a private conversation--click that, and you're good! To borrow the post right above mine:
The feature is called "private conversations" for a reason. Since the idea of individual private messages is rather clumsy--to follow an entire conversation meant clicking on numerous posts (in a lengthy exchange). A private conversation, instead, is like a private
thread between two or more members; every message in the exchange is in one place.
One question we get often on other XF forums: how do I
delete a private conversation? There is a link to "Leave the conversation." This will not delete it from the server, as the other party or parties in the conversation may still want to retain it. This does, however, remove it from your private conversations list. Once
all participants in a private conversation leave it, however, it is then deleted from the database permanently.