Need Help Creating New Items

I'm trying to create new items on my server i use but it never works. I've been trying to make a new cloak taking Planewalker from dat20.xml and editing it in addition.xml. Then I edit it in create it in paint.net, save it on sothink,and test the server but it doesnt work. Any Help?

---------- Post added at 08:13 PM ---------- Previous post was at 07:29 PM ----------

can someone plz email me a vid of how to make items

Did you rebuild the server?

The server doesn't work or the item?