Google noindex, nofollow not working

I've recently deployed my website infortion & It has started showing in the google search results.

But the problem is that when I see the results in google search by typing site:infortion.com, then it's showing some unwanted pages in results, like this one https://www.infortion.com/answer/260 (which redirects the user to login first).

In order to remove this page I added, <meta name="robots" content="noindex, nofollow"> about 2 weeks ago, but still it's showing in the search results.

How can we fix this problem?