Half of my site is private for members only, should I use the Nofollow on these pages?

[DelcoUSA]

I'm trying to increase more traffic to my website. However half of my website is for members only and you have to be logged in to see content on those pages. I'm confused on whether I should use "nofollow" on these pages or not.

[StephanSolomonidis]

If you want to prevent member-only pages from showing up in Google's index (and I assume that is what you're after), then what you want is "noindex", or ideally just to block the pages in robots.txt. A quick look at your site indicates that there's members-only content in the 'resources' and 'presentations' folders (though of course there may be others you also want to hide). Then, in your robots.txt file, you'd put these lines:

User-agent: *

Disallow: /resources/

Disallow: /presentations/

Now even if Googlebot discovers these pages somehow, it won't crawl or index them, and you won't see these pages showing up in a Google search.