Step 1: Log into your cpanel
Step 2: From your cPanel interface, browse the right hand panel of categories until you find the Software/Services section. From there, click on the Softaculous icon.
Step 3: You will be brought to the Softaculous main screen. As phpBB is one of the more popular programs, it is found right on the front page. It also can be located under the Forums category on the left hand sidebar.
Step 4:Once located, click on either location to move on to the next screen.
Step 5: Next is the phpBB overview screen. You will notice the Install icon on the upper right corner area of the screen. Click that to begin the installation process.