I've been mapping for Portal for over a year, but just recently have I joined TWP as a member. I feel like an idiot asking this (because I know the answer will be right under my nose), but I was wondering--exactly how do you upload files? I couldn't find any button specifically marked "Upload", and I couldn't find help elsewhere on the forums. I promise I'm not as incomptent as my question makes me sound; I'm simply new to being a TWP member.
On a side note, what are the rules regarding uploading example maps? For instance, if I have a problem with level changes and I want to upload a map to demonstrate the issue, should I place the map in the "Tutorial Maps" section?
Thanks in advance!

If you still got questions, don't hesitate to ask!