On the Site Finder page you can manage your site
  membership by joining and leaving sites.
    The results list displays the public sites, moderated public
    sites, sites you created, and private sites that you belong to that match
    the search criteria entered. You can navigate to a site from this
    list.
    - 
        On the toolbar expand the Sites menu and
        click Search for Sites.
        
The Site Finder page displays.
 - 
        Search for a specific site or display all sites you have
        permission to access.
        
The results list appears beneath the search box.
 - 
        In the results list, manage your membership in sites as
        follows:
        
- Click Join to become a member of a public site.
 - Click Request to Join to request membership in a moderated public site.
 - Click Leave to remove yourself as a member from a site.
 
 
To navigate to a site from this page, click the site
    name.