The easiest way is to create a link to your RSS feed and place it on a website. By clicking on it, visitors will be able to subscribe to updates through their RSS reader.
Subscribe via RSS
Another way is to add a following meta-tag to the section of the HTML-page:
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* "Feed Title" - RSS feed title,
** "URL" - Destination feed URL.
If you have this tag, some browsers add a special icon, which is a link to your RSS feed, located in the right corner of the address bar.