Hello Kelly and welcome to the site
It seems that metal findings are just called "findings" but depending on the type of metal they are made from, this could describe them better. E.g base plate findings, prima findings, brass findings etc.
To post a picture within a forum post, all you need to do is create a new topic and look for a toolbar with numerous pictures, including that of an envelope. The next one after this image will give you the option to add pictures.
I hope this helps and if you have any questions then please let me know.