Take a look at these directions:
1. Choose which LAME file to download based on your OSX, http://wiki.audacityteam.org/index.php?title=Lame_Installation
2. Scroll down to section 3-1 Downloading and Installing
3. Click on the link and choose one of the options as listed below
- OS X 10.4 or later, Intel or PPC Mac:
Use the current Audacity and Lame Library v3.98.2 for Audacity.dmg.
- OS X 10.0 to 10.3, Intel Mac:
Use Audacity 1.2.5 and libmp3lame-osx-universal-3.97.zip.
- OS X 10.0 to 10.3, PPC Mac:
Use Audacity 1.2.6 and LameLib-Carbon-3.91.sit.
4. Choose to open the file, once it is downloaded run the package, select the Hard Drive icon and press the choose folder button
5. Make sure to set it up in the Audacity folder
6. Once you record your sound on Audacity choose to export the file.
7. When prompted navigate to the audacity folder where you have saved the file so it can be linked with your Audacity file. Once you have linked the folder to the file you will be able to export any Audacity file as an MP3