Problem is solved.
Go to line 151 and remove following code from the line
class=”requiredField”
you may remove asterix (*) mark from line no 135.
go to line 334 and remove following code
if ( empty( $content ) ) {
$errors[] = __( ‘Empty post content’, ‘wpuf’ );
} else {
$content = trim( $content );
}
and its done
http://www.techhelpforums.com/web-development/2852-make-description-field-not-required-wp-user-frontend.html