Title...

Depends on how new your version is, but I'm sure you have the right one to do this:
Type /whisper and then their name, almost exactly except for the clan/group ect.
Their name should appear in a gray box next the same kind of box that says "Game" on it. Click on that user's box to talk only to them.

Thanks! :3

I'll report this so it can be closed faster.
Just letting you know that too.

There is no need to report answered threads, in future. Closed.

He was telling the new player that he could report his own threads to be closed as an FYI.

Yes, and I replied with a there is no need to report answered threads to be closed as they are sometimes used for related questions. But yes, if you want your own thread closed for some reason or another report it.