To add to the previous reply.
A lot of sites have feeds without advertising it with a RSS icon but still link it in a way that Newsblur and other feed readers can find. So before guessing URLs or search you can simply take the URL of the site and past it in to add site in Newsblur.
Either Newsblur can find the RSS for you or as is the case for 9news.au, someone else as found the RSS and it is listed as a suggestion.