When importing you don't fill in any of those fields. You simply choose file, select the xml file, and click import.
It sounds like you may have created a blank product with the same name. You should uninstall it before trying to import the right one.
Check out this video on how to install a mod:
http://www.youtube.com/watch?v=GdZ5qfgapBg
You can probably skip the first 5 minutes.