How to Changing the Configuration File?

Changing the Configuration File:
>> con_db.php
//Mysql db connection information
$hostname =''; //Hostname (example: localhost)
$database =''; //Database (example: dbbacklinks)
$username =''; //Your database username (example: root)
$password =''; //Get your password database (example: password)

//Website Information
$web_base = ""; //Your website address (example: http://www.yourbacklinksdomain.com), for a subdomain (example: http://subdomain.yourbacklinksdomain.com)
$web_domain = ""; //Domain website (example: yourbacklinksdomain), for subdomains (example: subdomain)
$web_domainext = ""; //Website domains (example:.com,.net or others), for a subdomain (example: .yourbacklinksdomain.com)
$web_title = ""; //Website title
$web_description = ""; //Website description
$web_keyword = ""; //Website keywords
$web_favico = $web_base. "/favicon.ico"; //Website icon
$web_email = ""; //E-mail contact
$web_session = 30;//next second submit (on refresh in second)

>> .htaccess
#if use main domain redirect to www.yourdomainname.com or others
#RewriteCond %{HTTP_HOST} !^www\.
#RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]

##if use subdomain
RewriteCond %{HTTP_HOST} !^subdomain\.domainname\.com$ [NC]
RewriteRule (.*) http://subdomain.domainname.com$1 [R=301,L]