When you post a trade request on your BK Trade Channel, the request will only be seen by the members of that particular BK Trade Chapter. Those members may respond to your posting on a private channel.
You may also post a trade for non-members.
You may post your trade all over Egypt, if you like. Simply type "please BROADCAST" at the end of you posting. Your posting will then appear on the channels of all the BK Traders Channels across Egypt.