Tips on Customizing SEO Landing Page Generator

How to Hide IntellaSoft SEO Landing Page Generator Admin Menus

function plt_hide_seo_landing_page_generator_menus() {
	//Hide "SEO Landing Page Generator".
	remove_menu_page('issslpg_location_settings');

	//Hide "Template Pages".
	remove_menu_page('edit.php?post_type=issslpg-template');
	//Hide "Template Pages → Template Pages".
	remove_submenu_page('edit.php?post_type=issslpg-template', 'edit.php?post_type=issslpg-template');
	//Hide "Template Pages → Add New".
	remove_submenu_page('edit.php?post_type=issslpg-template', 'post-new.php?post_type=issslpg-template');
	//Hide "Template Pages → Category".
	remove_submenu_page('edit.php?post_type=issslpg-template', 'edit-tags.php?taxonomy=issslpg-template-category&post_type=issslpg-template');

	//Hide "Landing Pages".
	remove_menu_page('edit.php?post_type=issslpg-landing-page');
	//Hide "Landing Pages → Landing Pages".
	remove_submenu_page('edit.php?post_type=issslpg-landing-page', 'edit.php?post_type=issslpg-landing-page');
	//Hide "Landing Pages → Add New".
	remove_submenu_page('edit.php?post_type=issslpg-landing-page', 'post-new.php?post_type=issslpg-landing-page');
}

add_action('admin_menu', 'plt_hide_seo_landing_page_generator_menus', 1000000000);

Where do I put this code?

How to Hide IntellaSoft SEO Landing Page Generator Meta Boxes

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

	//Hide the "SEO Landing Page Generator" meta box.
	remove_meta_box('issslpg_local_content_selector', $screen->id, 'side');
	//Hide the "SEO Landing Page Generator: Shortcode Overview" meta box.
	remove_meta_box('issslpg_shortcode-overview-box', $screen->id, 'normal');
	//Hide the "SEO Landing Page Generator: Alt Text Shortcode Overview" meta box.
	remove_meta_box('issslpg_alt-text-shortcode-overview-box', $screen->id, 'normal');
	//Hide the "SEO Landing Page Generator: Large Market Content" meta box.
	remove_meta_box('issslpg_large_market_content_panel', $screen->id, 'normal');
	//Hide the "SEO Landing Page Generator: Local Images" meta box.
	remove_meta_box('issslpg_general_images_panel', $screen->id, 'normal');
}

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