[Jolten]

You'll need to edit templates and add something like:

PHP Code:

<if condition="(in_array($bbuserinfo['usergroupid'], array(X,XX,XX)))">
 the reply or new thread button here
</if> 


Replace the Xs with the usergroupid numbers you DO want to see the buttons.

Or, conversely use :

PHP Code:

<if condition="!(in_array($bbuserinfo['usergroupid'], array(X,XX,XX)))">
 the reply or new thread button here
</if> 


and replace X with the usergroupids you DO NOT want to see the buttons.


Untested, but I believe that's correct.