converting Wav to MP3 on Apple Music not working

Hello. I am beyond frustrated. I've had a Mac for almost two decades. This is my first post. If you're able to help--please do.

I record a small Podcast/weekly talk. My Zoom wired recorder broke. I so got the new Zoom2 but it doesn't record in MP3--it records in WAV files.

Alas, I am now two weeks behind trying to figure out how to convert these files on Apple Music. I can get the file into Music, follow the basic instructions of changing the download into "MP3", but it doesn't give me a convert option anywhere.

I am stuck.