You give that download link to people and they can download off it.
They click the "Free" button beside "Select your download:".
It'll say "You have requested the file whateveritis.mp3 (28026 Bytes). This file has been downloaded 0 times already.
IMPORTANT: Download-accelerators are only supported with a PREMIUM-Account!"
Underneath that, there will be a countdown. When the countdown finishes, your file is ready for downloading right underneath the countdown.