How do I delete songs in my Top Rated??

As far as I can tell I have unrated... Meaning all starts on the songs that I do not want in my Top Rated are all grey now. And the ones I want to keep in my Top Rated are blue. But the ones I do not want in my Top Rated are still there. How do I get rid of the ones I do not want in my Top Rated?? Thanks In Advance!!