What is VBulletin?

Taken from vbulletin.com.

vBulletin is a professional, affordable community forum solution. Thousands
of clients, including many industry leading blue chip companies, have chosen
vBulletin - It’s the ideal choice for any size of community.

Making your site a hub for information and discussion encourages visitors to
return again and again. It’s also a highly effective way of improving your
service to customers or users of your website. Our dedicated development team
constantly strives to keep vBulletin at the forefront of new Internet
innovations, while always keeping an eye on security and performance.

How to install vBulletin?

Download the package from the vBulletin site. Extract the file to the
webserver. Make sure you already create database name on your mysql. Open your
browser and type http://yourdomain/vbulletin/upload/install/install.php.
Click next to continue installation.

Verify configuration. Click next to continue installation.

Connect to the database. Click next to continue.

Creating tables. Click next after finish creating tables.

Altering tables. Click next to continue installation.

Inserting Default data. Click next to continue installation.

Importing Language. Click next to continue installation.

Importing style information. Click next to continue installation.

Importing Admin Help. Click next to continue installation.

Obtain some default settings. Click on the proceed button to continue
installation.

Import default settings. Click next to continue installation.

Obtain user data. Please put your admin username and password. Click proceed
to continue installation.

Setup default data. Click next to continue installation.

Congratulations!!! installation completed. Plz delete the following files
before continuing: install/install.php

Put your admin username and password to login to the admin control panel.

This is admin control panel. You may set the forum as you like.

This is your forum looks like. Have fun using Vbulletin.