I would like to change font size from small to 12px on forum topic.

To look like what you see here

Any help

Fatal error: main() [<a href='function.main'>function.main</a>]: The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition &quot;jsmfFrontend&quot; of the object you are trying to operate on was loaded _before_ unserialize() gets called or provide a __autoload() function to load the class definition in /home/tawhiydn/public_html/components/com_smf/smf.php on line 106

Any Help!!