Install Apache Modules on Webmin

[Jorge <jorgeska@gmail.com>]

I am newbie on Webmin + Virtualmin. Since I used cPanel it was very easy 
to enable modules such as gd, fileinfo, exif, mysqli, ... using EasyApache.
In Webmin I guess it should be done under Servers - Apache Web Server - 
Configure Apache Modules, but there the former modules are no present.
What am I doing wrong?

Thank you very much.