What to do with closed pages that got into the search?

Question

Search Engine Optimization

Hello. I ask for advice, in a banal question.
Question one:
The search included pages like authorization, registration, etc. after that I hid them in robots.txt. Please tell me how to be now? delete them in Yandex.Webmaster or do nothing? And will they disappear?
And question number two: I check the
link sity.ru/kontakty that's what gives me about it "The page is managed by a robot, but is not in the search."
More:
The page duplicates the site.ru/compare/ page already presented in the search. Give the robot a preferred address with a 301 redirect or the rel="canonical" attribute.
But the compare page is a product comparison page. I also hid it in robots.txt after it got into the search. Tell me what to do in this case?

Answer 1

both delete through the webmaster, the second question will be solved