I suggest checking your email. You'll get an email every time you upload a new song. However, like Kinsei01 said, your first song has to be approved by a moderator before it shows up. I'm pretty sure you'll get an email if it doesn't get approved.
@Kinsei01
Actually, the approval process can also be very short. It took 15 minutes for me. :O But sometimes it takes weeks.
Kinsei
it has to go threw a very long approval process first.