Webmin Install Help

It has been a while since I installed MineOS.
The last time I did this, Webmin was part of the install, but not in Jessie.
I am struggling badly trying to make Webmin function.
Seeking for a step by step guide on how to install, and configure the firewall to make this function so I can access Webmin using a browser on a Windows PC.
Thanks in advance for any assistance anyone can offer.

See this thread for how to enable webmin.