Virtualmin Glp : how install Lets'Encryp (01/05/19)


I have a web server with:
Centos Linux 7.6.1810
Webmin 1.900
Virtualmin: 6.06 (Version of Php 5.4.16 and 7.0.23)
Ip address: xxx.yyy.www.zzz

I created a server (in Virtualmin) named: xxx.yyy.www.zzz

I’m looking for how to install a Lets’Encrypt certificate in order to be able to connect in https to my server to have access to virtualmin in https (https: //xxx.yyy.www.zzz: 1000)
Please Thank you

Have a good day