'Parse error: syntax error'

You’re going to need to copy your functions.php file onto your hard drive, edit it and re-upload it once it’s fixed.

This will get you started: https://codex.www.ads-software.com/FTP_Clients

You should also look into code editing software – there are some decent free options available, just look to Google. Something with syntax highlighting makes tracking down this type of error MUCH easier.

For future reference, I’m venturing to guess that you copy and pasted the code exactly as it sits on that site. That would explain the error your getting. You shouldn’t have copied the php tag (<?php) but instead copied everything but the opening and closing php tags.

eg:

/**
 * Register Widget Area.
 *
 */
function wpgyan_widgets_init() {

	register_sidebar( array(
		'name' => 'Header Sidebar',
		'id' => 'header_sidebar',
		'before_widget' => '<div>',
		'after_widget' => '</div>',
		'before_title' => '<h2 class="rounded">',
		'after_title' => '</h2>',
	) );
}
add_action( 'widgets_init', 'wpgyan_widgets_init' );

Thank you both! The problem has been resolved!