Thank you for your answer. But I know where to change it. But I don't know what I can remove without affecting my SEO. 
	Google Ads requires subpages to be indexed.
	However, I don't want to share the shopping cart or login page. 
	The robots.txt file looks valid. However, google thinks otherwise. 
	I think that removing it, is a bad idea.
	 
	Maybe someone had a problem with ads and solved it somehow?