phpbb is based on php scripting language - which outputs html, it's easy to implement if you have an apache server (which there is on a mac) with php activated - you'll also need a mySQL database integrated with said server.
The "online language" my friend is html - you'll have to make do with it - you can't make a decent and easy to use forum using flash with a minimalistic approach.
You will most probably not have to code anything yourself, so once you've made the proper changes on your server you'll be good to go.
None of these forum applications require you to know any php or html unless you want to modify the look or function of them. What you do need is a server with php and mysql running on it. And you need to know your mysql username and password and be able to type these things either into an auto-installer prompt or directly into a text file in the appropriate location.
Installing php applications might seem a little technically daunting at first glance, but they are actually quite easy. It typically involves placing the files on the php/mysql capable server and then entering your mysql log in information and running an install script by loading it in your web browser.