You will be taken to an Overview page about phpBB in the right window, where you can view more information about the software before you install it. When you are ready to install, look to the top of the window, and click on the Install tab. This opens a Software Setup window. The first option is to Choose a Domain. If you have multiple domains associated with this account, then you must select the domain to install the software on. The next two boxes require a directory and database name, neither of which should exist on the server.
Under Site Settings, enter a Site Name, Description and Board Email. These can be changed later on from the application's admin panel. Next, In the Admin Account section, type the desired admin username and password that should be used. Also enter the admin's email. Click Install when you are ready.
This will take you to a congratulations page, that will let you know that the software has been installed correctly. There will be a link to view your new forum, and a link to the new admin panel. This concludes this tutorial. You now know how to install phpBB using Softaculous.