How can a basic user manage their Filters?

I am a basic user of the free Sugar product.
When I first started I tested out filters for my own use, and created many filter names that are now useless.  These appear before the system filters.
e.g. Leads - Filters now shows several of my filters before "All Leads" and "Assigned to Me".

I can't find any way to delete these filters, or even to modify them to something useful now I know my way around sugar a bit better.

Why are users able to create their own filters but not delete them or change them?

Any help much appreciated.
Thanks