In the Admin section click on "Blog Settings" and then click on "User Permissions" and or "Group Permissions"

Thank you. Umm. It is not exactly the way i want. let me think on how to ask clearly again. Then, i will ask again. Thank you.

Farzana

I'm not sure if this plugin works with the latest versions, but if it does then it would appear to be what you want ;) ( [url=http://b2evo.astonishme.co.uk/extra_comment_control]Extra Comment Control[/url] )

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Hello again,

Thank you for helping me. I am using the latest version. I have been thinking about it really hard and I came up with this crazy and a bit time consuming idea.
I am thinking of controlling the users by crosschecking with my email database that I created. Also I am thinking of making comments as "Draft" and then, I will publish them later once the email they put is the same as my list.
Please let me know if it is a bad idea. I am open to any suggestions. Thank you so much.
Farzana