As brother thargas has explained, you need to look at the documentation. Type perldoc File::Find and you'll be presented with an example in the Synopsis section that should answer your question:
use File::Find;
find(\&wanted, @directories_to_search);
sub wanted { ... }
You pass
File::Find::find two parameters: a reference to a function that will be called when a matching file is found, and a list of directories to be searched. And it should Just Work(tm).
Alex / talexb / Toronto
"Groklaw is the open-source mentality applied to legal research" ~ Linus Torvalds