If you want to subscribe to a wordpress.com hosted blog’s feed you need to know the blog’s feed URL (Read: Top 10 Widely used Blog Platform). RSS feeds will help you to get the content from a site without having to go visit the site. You can use the different feed reading applications to read the feeds
The feed urls for blogs on wordpress.com will be:
Note: substitute your blog’s name in for YOURBLOG in the URLs above.