I presume you're using windows. If so, then you should know how things work! To know what your shared folders are & to add any others, go to LW's menu Tools-Options & Sharing. This will list the folders you're presently sharing & there's an Add button if you wanted to add more shared folders.

You can safely remove items out of the shared folders if LW is not open. Likewise, if you decided to share your dwnld folder (Tools-Options-Saving to know which one this is), then you can add it the way suggested above. Again u could safely remove items if LW is not open (else check the monitor window to see if anybody is uplding the particular file from it.)

p2p is all about sharing. If people choose not to share for whatever reason, then it makes the Gnutella netwk much less effective. Less alternative choices for people to dwnld from. It affects U just as it affects everybody else. Imagine if everyone was a freeloader. There'd BE no files to dwnld. Also it might have already been mentioned in this thread, but many people filter out those who share less than a certain no. of files be that 5, 10, 50, 100, or 500+. As a freeloader you'd only be able to dwnld from them on those days you decided to share. But then being inconsistent means you'd have difficulty reconnecting to them. Also not having people uplding from U means you will miss out on links to other peers & your search results, connection quality & speeds will suffer.