You mysteriously disconnected from FB chat while I was trying to explain
Make sure you've created a page for yourself first.
1. Log in to your Last.fm user account
2. Click the arrow beside your name, and click on "Music Manager"
3. You'll see 3 boxes, click on the first, which is "Upload Music"
4. Click "Browse" and choose the Mp3 file you want to upload.
Last.fm will only allow you to upload Mp3 files. If you have them in WAV, you'll have to convert them to Mp3 first. There's no limit to the songs you can upload. Tell me where your'e stuck and I'll try to help. If Last.fm doesn't work, you can make a Myspace Music account, but that will only allow you to upload 6 tracks.