Thanks for your patience.
I have the keys there. I pressed Power button on EmuNAND.
So, I just have to rename this prod.keys file to keys.txt and put it in nut folder? Or I ave to copy key by key and just complete what is asked in the template?
Technically you are supposed to copy paste just the necessary keys according to the template but yeah, you can just make a copy and call it keys.txt and drop it in.