Help me to install phpbb 2 discussion board in my website

sir
I have a problem with installtion of phpbb 2 Forum in my website...
I am having a website named http://www.clickonlinejobs.com Also i plan to include forum with it.So i have added my forum in my sub domain named
http://www.forum.clickonlinejobs.com...

Here is the steps what i done for installation

1.Based on Flash video tutorial which available in http://www.phpbb.com i copied my extracted phpbb files into my sub domain which located in my server
/public html/forum and copied files succesfully into the server using Filezilla uploader.

2.The next step I changed the file attributes for config.php to 666
By earlier the file size is 0 Bytes.After changed the value into 666 still config.php
is 0 Bytes..

3.I created my database named selvam_db in my SQL server version 4.1.21-
standard in my control panel. Then Databased password is password

4.Then i create a username and password for database as follows...
USER NAME : selvam_admin
PASSWORD : password
then i linked the corressponding databased with their user name and password.

5.Now i am ready for installation.
Now i am ready with my database name and USER ID and password for installation as follows.
Database name : selvam_db
USER NAME : selvam_admin
PASSWORD : password

Now i started my installation by typing in the browser window as http://www.forum.clickonlinejobs.com
Surprised the installation was started....

As per Procedure i entered the following details for installation...

Default board language: English
Database Type: MySQL 4.x /5.x
Choose your installation method: Install

Database Configuration

Database Server Hostname / DSN: localhost
Your Database Name: selvam_db
Database Username: selvam_admin
Database Password: password
Prefix for tables in database: phpbb_

Admin Configuration
Admin Email Address: skdivyaa@gmail.com (This is my Email address)
Domain Name: http://www.forum.clickonlinejobs.com
Server Port: 80
Script path: /
Administrator Username: clickonlinejobs
Administrator Password: *mypreferred securedpassword*
Administrator Password [ Confirm ]: *mypreferred secured password*

After Entering start install i got following error message.

An error has occurred during installation
An error occurred trying to update the database
CREATE command denied to user 'selvam_admin'@'localhost' for table 'phpbb_auth_access'

What is the Problem now ? Can You guide me to install phpbb in my website ??
I am a complete begginer Expecting Your Earlier reply in this regard

Thanks in advance

Selvam