Websites usually display one or more of the following icons to indicate that RSS feeds are available:
Using a browser equipped with an RSS reader
Some browsers allow subscriptions to RSS feeds. The browser will display an RSS button at the end of the address bar or in the tool bar whenever you visit a webpage that provides a feed. Just click on the RSS icon to subscribe. You can then view the latest information via the browser's bookmarks or a shortcut in the tool bar.
Using a dedicated RSS Reader
Free RSS readers are easy to find by searching online with keywords such as "RSS reader". When you have subscribed to or installed a dedicated RSS reader, you can add an RSS feed by copying an address, such as "http://rss.weather.gov.hk", and pasting it to the subscription box of your reader.