The trash can is the Junk filter. When you see files that are junk, select & press the trash can icon. Examples of Junk files are spammed files such as 1. autogenerated spam results, & also 2. autogenerated mp3 spam results, & viruses such as discussed here WARNING: Viruses on network you should be aware of! (click on link). In general, beware of files less than 2,000 KB (2 MB) in size. BTW the Junk filter is a dynamic learning filter. It learns bit by bit. Viruses are the hardest to filter out. It will but takes much persistance.

The stars in the quality column represent your chances of connecting to the host for downlding that file. There's up to 4 stars. Recommended are 3 or 4 stars.