How to filter out results from certain websites

Help
ed447
2013-12-04
2013-12-04
  • ed447
    ed447
    2013-12-04

    I search for key words and get a lot of results from a few websites that I don't want results from. How can I filter out these websites please? E.g. I don't want any results from www.reuters.com . I haven't been able to get this to work using Tools > News Filters (it says it hasn't found any matching news). Thank you very much.