wp_nonce_field('tld_wcdpue_settings_nonce_action', 'tld_wcdpue_settings_nonce_field');

$tld_wcdpue_settings_email_content = get_option('tld_wcdpue_settings_email_content');

wp_editor( $tld_wcdpue_settings_email_content, 'tld_wcdpue_settings_wpeditor', array( 'wpautop' => false ) );

if( isset(//does authentication here) ){

update_option( 'tld_wcdpue_settings_email_content', wp_kses_post( $_POST['tld_wcdpue_settings_wpeditor'] ) );

}