Hide hack in phpbb 2? can't find it?

[Professional Dude]

Hi

i am looking for a simple hack, that hides the links or whatever you want to hide and it only shows to registered users..

i can't seem to find any links to that hack

or there is one more that shows links when someone replies..

let me know if you can find any of these hacks
i need them

Thanks
+rep for helpful answers :)