here is a step-by-step tutorial on how to convert WAV to MP3:

1. Open Windows Media Player and import your WAV audio file into the program.
2. Click "Organize" on the upper-left of the screen.
3. Choose "Options" from the drop-down menu.
4. Select the "Rip Music" tab.
5. Choose "MP3" from the "Format" drop-down menu.
6. Click "OK" to save your settings.
7. Click "Rip CD" to convert your WAV audio file to MP3.

Alternatively, you can use an online converter such as Convertio or FreeConvert to convert your files.