yes you can.
Just right click the correct one and hit copy shortcut, then go to the original post and hit edit.
Delete the failed link and paste the right one.
It doesn't matter how long the link is if you do the right click and copy shortcut thing Tiffany.
It should work fine.
Thhe link you have up as a signature doesn't take you to your music.
It is Flu Elise etc, so I suggest you edit that also.
Graham