How do I put phpBB 3.3.14 on Neocities.org?

[neocitiesuser]

Hello. I am looking to put phpBB 3.3.14 on Neocities.org, but I do not know how to do so. Please help, as I cannot list anything else in detail.
Do I just put all the setup files in neocities or do i just set it up FIRST then put the php inside.

[thecoalman]

You can't. You need to be able to execute php and it also needs back end database. These are common feature on any cheap hosting plan for a few bucks a month. If it's available on free hosting there is always strings attached.

https://neo-neighborhoods.neocities.org/geocities/homestead/FAQ/
Do you allow PHP or other programming languages? Neocities intentionally only provides static hosting (such as HTML, CSS, JS). As such, we cannot provide access to any "back-end" programming languages.

I would avoid any free hosting for phpBB forum. Inevitably the service disappears with no warning and your forum is gone, if that doesn't happen some day you will decide you want to move it only to find you can't or they want to charge some ridiculous fee for copy of the DB and files.