about thread Prefixs
 

hi guys,
iam use thread prefixes in my vbulletin
but how can i change only the prefix color or change to under line or italic?

You can 'decorate' them in the Prefix manager. Or, if you want to do it to all of them, modify the threadbit template and probably the lastpostby template (not sure about that one).

can i do that by CSS
only thread prefix detached with the thread title

You may create a class for it and apply that class to the prefix. However, it does not already have a class applied to it that you may modify.

i search in threadbit template for this prefix but not useful for me
can some one tell me the thread prefix in template which variable is accountable for it

It's called $thread[prefix_rich]