In this wordpress blog, one can vote the comments. I am wondering how can I set up this function in my wordpress blog?

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If your blog is self-hosted, the easiest way to add a comment voting system is to install a plugin (e.g. Comment Rating). If your blog is on WordPress.com, then you'd need to go through the options the options on WordPress.com to see where you could enable that functionality. |
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Thanks to Manzabar's answer, I solve the problem as the following picture shows:
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