Thread:MotherEarth/@comment-4499980-20121117210425/@comment-4499980-20121118014100

The naming policies are explained on the page I linked. There are two ways to categorize your files. If you're uploading from the dedicated page (the one I linked) you can select a category from the drop-down menu labeled "Licensing". If no category from the drop-down applies to your file, do what's on this second paragraph.

If you're uploading from the condensed widget by clicking "add a photo" on any page or on the "New Photos" page, you will need to go to the file page once it's uploaded, click on the bar at the bottom that says "Add a category" and type it in. While typing it in there will be some suggestions that appear and that will usually meet your requirements.