change fcgi to apache or php-fpm

Hi, i have a server with Centos 6.9 with latest virtualmin 6.02

i try to change my virtual server from fcgi to apache or php-fpm.

on documentation i read the option is virtual server -> server configuration -> website options

but when i click i see only Default website for IP address? Yes or No PHP information

but i can't change fcgi or php-fpm

and in other place i read system settings -> server templetes -> default settings Edit template section: php options Default PHP execution mode = Here can i choose and i changed value.

but this not works on virtual server already created...

how i can modify this value on virtual server in use?

thank you in advance

Alessandro