how do you do this?
You can import any WAVE file into your DAW and export it as an Mp3 file. Alternatively most media players can do the conversion for you, like iTunes.
thank you
Audacity which is a free download can export as MP3.
If you download Audacity be careful to get the makers version, some versions come with unwanted add ons.
What hastfuego said. Audiacity is the one I use.
Plus, it’s a really useful waveform editor. For free.
[quote]georgekadar (07/12/2011)[hr]how do you do this?[/quote]
itunes converts wav to mp3
just put track in your itunes library right click and choose create mp3 version 
thanks again guys
Just adding BonkEnc to the list of programs that will convert wav to mp3 (for free). Also converts multiple other file formats to other file formats (flac to wav, etc.).
On my mac i use the free program Switch, what works easy
I use sound converter because it’s got loads of options and it quick!