The problem that says "Error establishing a database connection" means that you have not configured database setting for your install in wp-config.php and sample for the same is provided with wp-config-sample.php.
You have to change the name of wp-config-sample.php to wp-config.php and fill in the database details like username, password, host (localhost/whatever), database name. Consider creating the database with phpmyadmin from the control panel.
After configuring wp-config.php you can start the install.
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The problem that says "Error establishing a database connection" means that you have not configured database setting for your install in wp-config.php and sample for the same is provided with wp-config-sample.php.
You have to change the name of wp-config-sample.php to wp-config.php and fill in the database details like username, password, host (localhost/whatever), database name. Consider creating the database with phpmyadmin from the control panel.
After configuring wp-config.php you can start the install.