you can upload it under the
community downloads - in the right area, of course. make a new thread with the "new thread" button.
you have to put the files in zip/rar folders (download either winzip or winrar), and then you upload them from your computer using the "manage attachments" button (it shows up when you choose the advanced editing, or when you post a new thread).
remember to also put up a picture of your upload.