You inbox someone by messaging them. If you inbox someone his/her message will go to his/her inbox.
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you go onto the top part of the facebook screen. it will say " Home-Profile-Friends-Inbox". you click on the Inbox and there you are, at your inbox
If you compose a message from your Inbox then it is private. If you post something on someone's wall it is not.
If they say 'Inbox me!' or something like that they mean they want you to add them as a friend on facebook.
One cant edit a sent inbox message on Facebook. One simply has to send an edited message and explain where the error came from. Facebook doesn't have a way to edit a sent inbox message as of yet.
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