Well. If you are talking about phpBB2.2, here are some instructions on how to install a phpBB forum onto your
web hosting account.
You can either install phpBB2 from something called Fantastico, which will automatically install phpBB for you within a matter of seconds.
This may be convienent for you as it will mean you wont have to download the files from phpBB's
website hosting to install the forum. It will also mean you are quickly able to upgrade the forum when new releases of phpBB2 are distributed. However, the likelyhood of another version of phpBB2 being released is quite low, as the phpBB team have been working on a new project (phpBB3), which is set to release very soon.
If however, you do not want to install phpBB from Fantastico, you'll have to install it manually. You can do this by going to
http://www.phpbb.com, and downloading the latest phpBB2 release. You will then need to upload this to your home directory, and unzip it via cPanel or SSH (if you have access).
Then simply open the forum in your web browser, and you'll see the instalation screen. The install is pretty much self-explanatory, so you should have no problems if you are installing it this way.
If you are trying to copy over a forum from a previous web host, you'll need to backup the database from the forums Administration panel. When you have made a backup, and have installed a new forum on your new hosting account, you'll be able to upload the backup from your new forums administration panel.
If you want to copy skins/logos and other images, you'll need to copy over the images directory, and the skins directory from your previous web host.
This can be done via FTP. If you are not too sure on how to do this yourself, open a ticket at eUKhost, and I'm sure they'll get this done for you.