title: How to allow self-registration to join a specific Wordpress MU blog
body: <p>I have a Wordpress MU instance installed.</p>
  
  <p>I allow self-registration, and self-creation of blogs.</p>
  
  <p>I have a user who has created a blog for a Chemistry class.  He wants his 100 students to be able to self-register and become authors on this blog.</p>
  
  <p>By default, when you follow the Wordpress MU register link, you are signing up for a site-wide account not for this specific blog.</p>
  
  <p>How do I do this?  It would be very painful to have to add the 100 students one by one as the administrator.  Besides that, we don't actually have a list of the 100 email addresses.  </p>
  
  <p>I need a way that people can either request to become part of the blog, or automatically start contributing right away.</p>