To answer/reply to a Facebook message all you need to do is go onto the message you want to reply to. Under what you have been sent there is a blank bar so type in your message then on the right click reply.
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if you have a facebook message then it is already on facebook
click on the message
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.
Simply go to the message section, type the name of your facebook friend to whom you want to send message in the 'to' box. Type the message and simply send it.
Click the button that is down to your right to send a message on facebook to someone that is online!