[Plugin: NextGEN Gallery] help with template=sample2

Hello,

I try to install unsuccessfully The template=sample2
,I read the forums how to do it but still I could not and did not understand how to do this.
I use ATAHUALPA theme and I can not find the folder: /wp-content/themes/default/nggallery/gallery-sample1.php
Help me and tell me please step by step how I can get the template=sample2

https://www.ads-software.com/extend/plugins/nextgen-gallery/