I'm trying to upload one of my songs, but it keeps saying the format is wrong. I think the reason is because my song is a wav file and its supposed to be an MP3. So how do I make it into an MP3? Thanks.
You can use iTunes

follow the instructions in the second half of this page http://www.simplehelp.net/2006/08/14/how-to-convert-flac-files-to-mp3-using-windows/

Set the options to 128kbps and 44kHz
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