Add nofollow to 'Sign In' and 'Add Listing' in header?

I am making some on-site SEO improvements to my site and would like to add nofollow to 'Sign In' and 'Add Listing' links above the header. How do I do this?

(Screenshot attached)

 

Hello,

For this
Go to the geocrafttheme\library\controls\module_functions.php

And add code given below as shown in the image.

Code:

rel="nofollow" 

Thanks & Regards
Nitesh Raghuwanshi