How to format 'Product Review' text box font ?

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(01-07-2012 12:00 PM)akm Wrote:  #4. make thread prefix=cr_

Not Thread Prefix, but Template Prefix.
AdminCP -> Forums & Posts -> Forum Management -> Edit/create a forum, scroll down the page. You'll find the Template Prefix setting there.

(01-07-2012 12:00 PM)akm Wrote:  Ps:  Difference between {$threadfields} and $extra_threadfields} ?

As far as I know, $extra_threadfields is used for displaying the series of XThreads input fields. So, the working area for that variable are in newthread and editpost (and in quickthread if you use quickthread).
$threadfields is an array for displaying the value of a custom thread fields (output).