How to Hide Plinkly – Smart CTA Buttons Admin Menus

function plt_hide_plinkly_smart_cta_buttons_menus() {
	//Hide "PlinkLy CTA".
	remove_menu_page('plinkly-cta-dashboard');
	//Hide "PlinkLy CTA → PlinkLy CTA".
	remove_submenu_page('plinkly-cta-dashboard', 'plinkly-cta-dashboard');
	//Hide "PlinkLy CTA → License".
	remove_submenu_page('plinkly-cta-dashboard', 'plinkly-cta-license');
	//Hide "PlinkLy CTA → Tracking Settings".
	remove_submenu_page('plinkly-cta-dashboard', 'plinkly-cta-tracking');
	//Hide "PlinkLy CTA → General Settings".
	remove_submenu_page('plinkly-cta-dashboard', 'plinkly-cta-general');
}

add_action('admin_menu', 'plt_hide_plinkly_smart_cta_buttons_menus', 13);

Where do I put this code?