...when you are on an ebay item that you want to post
...put the "arrow" on the actual address line , and right click which will highlight that address, then left click on "copy" ...and when you post your message then go to "edit" on the top left ..and left click on "edit"
then left click on past...and that should put the address you just copied into your post like this...
http://cgi.ebay.com/ebaymotors/ws/eBayIS...009532&rd=1
...see if that works!