You can't - why would you want to? It's a list showing the most visited pages in the past week/4 weeks - what would be the point of removing one or two if they're really popular? If you really want to remove a page, you can do the extreme and delete it :P.
You'd think it would be good that people are reading those pages - it ensures that rule violations will rarely occur. Plus, I'm not sure that many people even look at the list of the most popular pages (I may be wrong, though).