There are several ways to subscribe to different forums via RSS at allnurses.com, but an easy way to pick your favorite forums is using the General Site Map
Then click on the RSS feeds logos
for your favorite forums to subscribe to, see the screenshot below:
another way, is that most browsers have the RSS logo right in the address bar of sites that have RSS feeds available.
For example, below is a screenshot when visiting the Critical Care Nursing Forum
in The Firefox browser:
Here is a screenshot in IE (Internet Explorer:
I hope that helps!