The link is the one you originally added for your song. You'll find it at the bottom of your original message:
When you right-click on "head over heels.MP3", you'll get a context menu that looks something like this (depending on which web browser you use):
Select "Copy Link Location" (or "Copy Shortcut" if you're using Internet Explorer). This puts the link in the Windows clipboard.
When you click the icon for the MP3 Player, it will insert the following into your message:
[mp3=200,20,0,center][/mp3]
Paste the link right after the first "]".
So, for this particular song it should look like this:
[mp3=200,20,0,center]http://songcrafters.org/community/post-your-work/accoustic-recording/0/?action=dlattach;attach=134[/mp3]
That's it. Just click the Save button to save the changes to your message, then try the MP3 player.
Then do the same for the other songs you posted.
I hope that helps.
