1. Be sure that both the OPML Editor and River2 are fully updated.
2. The River2 version number should be 0.79 or greater. You can see the version number in menu area on every page in the desktop website.
3. Click this link, with the OPML Editor running, to go to the Bookmarklet install page.
4. Following the instructions on the page, drag the bookmarklet to your toolbar. You may want to rename it to something shorter.
6. Click the bookmarklet. You'll be transported to the Feeds page with the URL of his feed in the box.
Now, whenever you want to subscribe to a feed, just click the bookmarklet and it does all the tedious work for you. :-)