Tips on Customizing Popup Builder – On Page Load Popup, Exit Popup, Login Popup, On Click, Sticky Bar, Anti-AdBlock – FireBox

How to Hide FireBox Admin Menus

function plt_hide_firebox_menus() {
	//Hide "FireBox".
	remove_menu_page('firebox');
	//Hide "FireBox → Overview".
	remove_submenu_page('firebox', 'firebox');
	//Hide "FireBox → New Campaign".
	remove_submenu_page('firebox', 'post-new.php?post_type=firebox');
	//Hide "FireBox → Campaigns".
	remove_submenu_page('firebox', 'firebox-campaigns');
	//Hide "FireBox → Analytics".
	remove_submenu_page('firebox', 'firebox-analytics');
	//Hide "FireBox → Submissions".
	remove_submenu_page('firebox', 'firebox-submissions');
	//Hide "FireBox → Import".
	remove_submenu_page('firebox', 'firebox-import');
	//Hide "FireBox → Settings".
	remove_submenu_page('firebox', 'firebox-settings');
	//Hide "FireBox → Documentation".
	remove_submenu_page('firebox', 'https://www.fireplugins.com/docs/?utm_source=product&utm_campaign=firebox-free&utm_medium=misc&utm_content=documentation');
	//Hide "FireBox → Upgrade to Pro".
	remove_submenu_page('firebox', 'https://www.fireplugins.com/firebox/upgrade?utm_source=product&utm_campaign=firebox-free&utm_medium=pro-feature');
}

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

Where do I put this code?

How to Hide the "FireBox Settings" Meta Box

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

	//Hide the "FireBox Settings" meta box.
	remove_meta_box('firebox_settings', $screen->id, 'advanced');
}

add_action('add_meta_boxes', 'plt_hide_firebox_metaboxes', 20);