It's hard for me to tell whether you're seeing the field and you don't want to see it anymore, or it isn't there and you want to have it be there. But either way, see the screenshot attached. The rightmost checkbox selects whether the field is visible or hidden. When checked, it should be visible. When it is not checked, then the field should not be visible.
The article that Andrew linked to you should explain how to get to the dialog where you can edit what appears in your Metadata dialogs.
HTH,
-Kirk