Tips on Customizing SwiftTrap for Mailtrap

How to Hide SwiftTrap for Mailtrap Admin Menus

function plt_hide_swifttrap_for_mailtrap_menus() {
	//Hide the "Mailtrap" menu.
	remove_menu_page('swifttrap-for-mailtrap');
	//Hide the "Mailtrap → Stats" menu.
	remove_submenu_page('swifttrap-for-mailtrap', 'swifttrap-for-mailtrap');
	//Hide the "Mailtrap → Settings" menu.
	remove_submenu_page('swifttrap-for-mailtrap', 'swifttrap-for-mailtrap-settings');
}

add_action('admin_menu', 'plt_hide_swifttrap_for_mailtrap_menus', 11);

Where do I put this code?

How to Hide the "Mailtrap" Dashboard Widget

function plt_hide_swifttrap_for_mailtrap_dashboard_widgets() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Remove the "Mailtrap" widget.
	remove_meta_box('swifttrap_mailtrap_dashboard_widget', 'dashboard', 'normal');
}

add_action('wp_dashboard_setup', 'plt_hide_swifttrap_for_mailtrap_dashboard_widgets', 20);