Thread:ColdShowers/@comment-4499980-20121228021523/@comment-4499980-20121228102514

OK.

After you upload a file, go to the file's page and scroll to the bottom, where there is a bar with a button that says "Add category".

After clicking that button, start typing in the category you want. As you type, suggestions of existing categories will appear, you can select the appropriate one from that list and click save. Since all of your uploads are for personal use, you should place them in the "Personal files" category.