How do I PM somebody

I find the site difficult to use in many ways. It's not intuitively obvious how to use some of the functions. For instance, how do I PM somebody? I don't know if the conversation is going out to the world or just to one person. Also, my inbox is full at 15 items and there is no way to delete anything. Is there a help menu? A way to get the site managers attention? Perhaps a tutorial?

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