I don't quite understand what it is you are asking for.
If it is a code you are looking at for your own items you will have to assign them one. I personally use the # that my camera gives to the pictures. ie if the picture of your belt is 389 you could use that as the item number.
You can also just set up a system and assign each item a # as it is made. It is totally your choice.
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If you are looking for the links that go back to your site to show off the item then open each one up and copy the url from the address bar to your post.
For the belt
https://icraftgifts.com/handmade/4270/bohemian-spirit-huntress-belt.phpFor the opal
https://icraftgifts.com/handmade/4025/opalite-art-nouveau-goddess-bracelet.php---------------------------------------------------------------
If you are referring to the message #'s on this forum then I haven't a clue.
Hope that helps somewhat?
Great products, good luck to you.