You cannot directly import RSS feeds from most NUS Libraries subscribed databases because of the proxy.
This tool rewrites links in an RSS feed to use the NUS Libraries proxy. Copy and paste rss feed url, and remove the portion that says libproxy1.nus.edu.sg. Click "run pipe". Then click "more options" and "Get a rss". Put that url into your rss feed reader
Pipe Web Address: http://pipes.yahoo.com/aarontay/nusdatabaserssconvertor