One of the largest groups on MuseScore.com is a group for the discussion of MuseScore.com itself.
Join Improving MuseScore.com to communicate with other MuseScore.com users and the MuseScore developers. You can, of course, share your scores with the group, but the real business goes on in the group's Discussions tab. You can ask for help and also request improvements to the site.
Keywords: improving MuseScore.