Tips on Customizing Nonprofit Manager

How to Hide Nonprofit Manager Admin Menus

function plt_hide_nonprofit_manager_menus() {
	//Hide "Nonprofit Manager".
	remove_menu_page('npmp_main');
	//Hide "Nonprofit Manager → Overview".
	remove_submenu_page('npmp_main', 'npmp_main');
	//Hide "Nonprofit Manager → General Settings".
	remove_submenu_page('npmp_main', 'npmp_general_settings');
	//Hide "Nonprofit Manager → Email Settings".
	remove_submenu_page('npmp_main', 'npmp_email_settings');

	//Hide "Membership".
	remove_menu_page('npmp_membership');
	//Hide "Membership → Membership".
	remove_submenu_page('npmp_membership', 'npmp_membership');
	//Hide "Membership → Member List".
	remove_submenu_page('npmp_membership', 'npmp_members');
	//Hide "Membership → Membership Settings".
	remove_submenu_page('npmp_membership', 'npmp_membership_forms');
	//Hide "Membership → Import".
	remove_submenu_page('npmp_membership', 'npmp_import');

	//Hide "Donations".
	remove_menu_page('npmp_donations_group');
	//Hide "Donations → Donations".
	remove_submenu_page('npmp_donations_group', 'npmp_donations_group');
	//Hide "Donations → Donation Settings".
	remove_submenu_page('npmp_donations_group', 'npmp_donation_settings');
	//Hide "Donations → Payment Settings".
	remove_submenu_page('npmp_donations_group', 'npmp_payment_settings');
}

add_action('admin_menu', 'plt_hide_nonprofit_manager_menus', 12);

Where do I put this code?

How to Hide Nonprofit Manager Dashboard Widgets

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

	//Remove the "Nonprofit Manager Summary" widget.
	remove_meta_box('npmp_summary_widget', 'dashboard', 'normal');
	//Remove the "Quick Add Member" widget.
	remove_meta_box('npmp_quick_add_member_widget', 'dashboard', 'normal');
}

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