I am computer-illiterate, please assist me

An mp3 is just a file like any other file. You need to "attach" it to your email. Look for a button in your mail program that looks like a paperclip, if you can't find it the attachment command will likely be under the File menu. Once you have the attachment dialog box up you will need to browse to the mp3 file, choose it and click "OK" or whatever in the dialog. Then complete your email and send.
 
If you sent it to your own email, if you do a forward on that email, you wont have to upload it again.

You can alter the bitrate on tracks, as some are really high, making them such big files.

I use DB Power Amp, but I am sure windows media player has the facility.

Although you have probably sent it now. Duh!!!!! Ignore me. LOLOL.

:hysteric: