There are only a few million installation guides on how to install phpBB. It's not very hard really.
1. Upload files.
2. Set permissions (if applicable) to things like the /files/ upload folder, and configuration files.
3. Make SQL database. This should be somewhere in your hosting control panel. If not, call hosting company, and/or get a database hosted elsewhere.
4. Run install. Usually its /phpBB_directory/install/index.php
The install will ask you for all the settings. You will need to specify the database settings (database name, username, password, host [usually 'localhost']) and it will compile all of that together.
5. So if the install was not able to write the new configuration, you will be given the option to download it, and manually upload it.
I've installed phpBB so many times, I could do it with my monitor off.
This post has been edited by Deomitrus: 1 Aug, 2008 - 08:08 PM