Dale, I guess you managed to get edit access, since you appear to have already removed the .jpg filename extension.
The Konica Minolta Users name is being appended because you're forgetting to log out of the KM Users account before uploading to the STF one. What you also need to remember is that with the STF Challenges you do NOT actually "log in" at all -- it's quite different from the KM Challenges in this regard. The procedure was described at this link:
http://forums.dpreview.com/forums/read.asp?forum=1009&message=21483495
To recap the essentials:
1. While in one of the the Konica Minolta Challenge galleries, click "logout".
2. Verify that the link word has changed to read "login". If not, click it again until it changes.
3. Go to the STF gallery to which you wish to upload, but DO NOT click "login". Again, you don't actually log in to the STF challenges. Uploading is done with only a password needed.
4. Click "edit this gallery", and enter the password "stfpost". That's all.
5. Remember that you must have cookies enabled (and retained), and you can only do follow-up edits from the same computer used for the upload.