how to install letsencrypt for one of my domains in virtualmin 5.5 with centos 6.8, nginx/1.10.2?

Virtualmin
1

Hello,
Please suggest me how to install letsencrypt for one of my domains in virtualmin 5.5 with centos 6.8, nginx/1.10.2.

I have many domains in my virtualmin.
I want to install letsencrypt for one domain.

I have seen this page :
https://www.virtualmin.com/node/38853

However, I am not sure if it works with nginx.

If you know of any guide that gives instructions, please inform.

Thanks