How to set blog templates (subdomains) to noindex?


I'm using New Blog Templates

As you can see, all my templates have the same content:

That means duplicate content. So I'd like to set all these templates (which are subdomains) to noindex.

How can I do? Is this possible with New Blog Templates? Or with Infinite SEO?
If not, shall I use a plugin like Multisite Robots.txt Manager? Or another one?

Thanks for your help.
Best Regards