this link should help you

http://www.phpbb.com/support/documen...l#quickinstall

There is some requirements for installing phpbb, I would suggest you to read.

My installation was easer, my hosting service provided me a cpanel wich comes with fantastico. I thought all the webhosting providers have a cpanel, if your do, then click on fantastico and you will find phpbb there, click on it and then click on installation... and you all set.