#2
File > Export > Wav

make a dmusic account, upload the wav file, give us a link
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#4
DMusic is a website that you upload music files to, to enable you to share them with people. However, DMusic does not support the file type that your Audacity creations are. You have to first convert them to mp3's using something like this mp3 encoder. If you read the guide on the website you should be able to figure it out. Good luck.