To receive new blog posts by email, simply click on the orange icon in the top right corner of any blog page. If you'd like just to receive updates on a particular author’s posts, click on the “RSS” link next to that author’s name. You will be taken to the blog/feed page and given the option to receive the feed by email.
Please note, however, that this does not work in Google Chrome. If you use Chrome, you need to install a plug-in in order to be able to sign up for rss feeds.