How to delete abusive comments

This is how I use Musescore:
Log in with ‘leerlingdenhulster’, now you see the songs I use in my lessons.
If you go to ‘Toonladder C voor de rechterhand ‘ on the right side of the page you see some comments (from pupils I think). One comment is:’kijk in je moeder kontgat’. I want to delete this comment because it’s very offensive.