Tips on Customizing Simple Membership

How to Hide Simple WordPress Membership Admin Menus

function plt_hide_simple_membership_menus() {
	//Hide "WP Membership".
	remove_menu_page('simple_wp_membership');
	//Hide "WP Membership → Members".
	remove_submenu_page('simple_wp_membership', 'simple_wp_membership');
	//Hide "WP Membership → Membership Levels".
	remove_submenu_page('simple_wp_membership', 'simple_wp_membership_levels');
	//Hide "WP Membership → Settings".
	remove_submenu_page('simple_wp_membership', 'simple_wp_membership_settings');
	//Hide "WP Membership → Payments".
	remove_submenu_page('simple_wp_membership', 'simple_wp_membership_payments');
	//Hide "WP Membership → Add-ons".
	remove_submenu_page('simple_wp_membership', 'simple_wp_membership_addons');
}

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

Where do I put this code?

How to Hide the "Simple WP Membership Protection" Meta Box

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

	//Hide the "Simple WP Membership Protection" meta box.
	remove_meta_box('swpm_sectionid', $screen->id, 'advanced');
}

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