At the VERY top of the page, next to "sign out" and the little bell alerts icon is a button for "upload music." Click that, select the category that best fits your piece, and fill in the form to upload your score, your midi file, etc. (:
Give a yell if you have any other questions.
i use anything that's available—mechanical pencils, non-mechanical pencils, ballpoint pens, quill pens, markers, sticks of charcoal, etc. i don't see why it would matter what kind of writing implement you use so long as the results are legible.
Please give more specific details about these pencils, some of them sound interesting (such as the black warrior and the blackwings).
I currently use bic mechanical pencils in addition to ballpoint pens in various colors, in addition to working directly in the notation software.