Noindex, nofollow @ private mode

I have some problems with adding noindex, nofollow metas into all the page tamplates available there within the casper theme.

I have added it via code injection. It worked well for all pages but login page which is used in a private mode.

How to add the metas there?

On the other hand where can I find a custom template for private mode login page?

Any hints? Thanks in advance.