Sending someone items....How do you do that?

When you go to your inventory, underneath the tab there are some icons. click the one on the right that looks like an envelope, and type in the name of the player you want to send the item to. (if that person's a friend, there's a dropdown list of friends name). if you're charging the person for the item, fill in the amount in the COD box, if not, just leave it blank and the other person will get it for free. =)