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: rails.info