how to add a include-activation to restful-authenticated?

I use restful-authenticated a months ago, but recently I got a spam
problem, so I would like to add a activation function on my site.
so, how to add include-activation to a original restful-authenticated
without activation function?

1) What versions of Ruby and Rails? -- run: script/about in your
project root.
2) You'll need functional email in your project
3) You'll also need
  3a) aasm plugin
  3b) rubyist-aasm gem (possibly)

You might also want to read: http://guides.rails.info/security.html