Where is the Firewall and its Controls

Nothing shows up as a FIREWALL in any of my searches via the manual or the computer. I cannot even tell if I have a Firewall on. I can’t put anything on the computer until I know it’s safe.
The manual should be a little more clear on this very important item.

The easiest firewall configuration tool for iptables (linux’s built in firewall) is Uncomplicated Firewall (UFW)
Until a Plasma 5 / KDE frameworks 5 (KF5) replacement for Kufw is created and/or it gets ported from kdelib4, the only option for now would be the GTK based gufw.