Step 2. After you have hosted the song, copy the DIRECT URL (the one that ends in .mp3). To be safe, open the link in your browser just to make sure the song plays.
Step 3. Now you're ready to embed the song onto your page, you can do that with this code...
<embed src="URL OF MP3" />
If you want the player to be hidden, use this...
<embed src="URL OF MP3" height="0" width="0" />
Now some people might have trouble using those codes... if you do, I suggest using a flash player (they're proven to work in all browsers). MyFlashPlaylist.com and PlaylistSpace.com are great tools to use.
If you have any free time at school after you have finished your work or you are at lunch and want to check your myspace, you can use Maskmy.info. It will let you bypass your schools security so you can go on myspace, fakebook, or any other blocked sites :)