Websites generally do not create RSS feeds automatically. There are various ways to create RSS feeds. One way is to use a service or program to generate the RSS feed file.
There are services and programs that
The Basic data
This is the recommended way to create a RSS feed from a website because generating a website feed using a service or program
Example: This is how they work.
Enfeedia is a free online service; no software to download. In addition to the basic features of RSS, it offers advanced features consistent with RSS specifications, including easy embedding of video and images (including flickr images consistent with their terms of service), PayPal buttons, Google search tool, and more. Multiple authoring modes are provided for collaborative posting of items onto the same feed including optional moderation of postings by the feed owner.

FeedXS has an interface that allows RSS feed items to be added using MSN Messenger by establishing a chat with the FeedXS bot. Clever!
This is a nice service. It allows one to use RSS directly without a Blog or Website. Each RSS feed item source links back to the FeedXS entry which is ok but unnecessary. It would also be nice to be able to point the source back to a URL of choice.
This is the standard online service to help create RSS feeds. It is simple and easy to use, but it is very limited. It offers little help in maintaining the RSS feed. It is effective for one RSS feed that is not often updated.
Conclusion:
My recommendations: