All English spaces include a static “Tags” widget in the right navigation. For general questions about tagging, hover over the “?
Help in upper right, or How to bookmark at the bottom of the page. Tags function as a user-generated navigation scheme and therefore make your space easier for users to find. When you tag a space, you create a bookmark for it at the same time. You can access your (and others’) bookmarks and associated tags by going to http://www.ibm.com/developerworks/mydeveloperworks/bookmarks/.