2012-06-21 7:56 am EST
You would definitely need to use a more specialized software, such as WordPress to do what you ask.
To require registered users in WordPress for commenting, simply log into the wp-admin dashboard, then find the "Settings" option on the left sidebar. From there click on "Discussion". Under the "Other comment settings" section on the page, there is a option named "Users must be registered and logged in to comment." Click that checkbox and that will required registration to comment.
I hope this answers your question. If you have any more questions or information specific to the issue please leave a comment below so we can further assist you.
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