You can easily add MP3 files into the wp-content/uploads/fwap-mp3 directory to create new track posts. All information like title, genre and cover image will be loaded from the ID3 tags in the MP3 file. If any information is missing, you can edit this in the track post later.
After you add one or more MP3 files to the directory, go into the WP admin, click on Fullwidth Audio Player/MP3 directory and drag your existing MP3 items into a playlist. After dragging the MP3 item to a playlist, a track post will be automatically created, here you can edit all track information again.