Forum Adding external php on the sidebars
 

I am trying to add external php/html/js stuff to my sidebar blocks but I can't do it. Do I need to create a another block first? What do I need to do exactly? Is there a tutorial how can you add stuff on the forums blocks besides the default latest topics, hot topics etc?

I couldn't even add a Facebook Fans sidebar block with that simple facebook js?

I'll greatly appreciate it if someone can guide me to some tutorials or has any advices.