I'm starting 12 day free trial and can't get to first base.

I"ve uploaded an xml file to Musescore. The file plays just fine, but only highlites the treble clef score. The equalizer only shows "Piano" as instrument. I need Tenor and Lead on Treble Clef and Baritone and Bass on Bass Clef. I would like to separate these parts for individual practices on Cantamus. Do I need to "publish" to get this ability or does this need to be corrected on the 'Muse" level?