To install the current official release, get ports or packages.
To install the bleeding edge, get area51.
Once you have installed whichever version of KDE you like (official ports of KDE4, or KDE Frameworks, Plasma Workspace and Applications from area51, as of early 2017), there are a few more steps to get it running, which we try to list here.
X Window System
You should have the following packages installed and configured:
- DBus - HAL - procfs ([https://www.freebsd.org/doc/en/articles/linux-users/procfs.html)
Without them, either KDE software won't run, or you won't have a keyboard and mouse in the X Window System, which reduces its usefulness considerably.
After installing KDE workspace (`x11/kde4-workspace`) either via ports or packages, you can add `kdm4_enable="YES"` to `/etc/rc.conf` to boot into KDE Plasma Desktop via KDM, the KDE Display Manager.
Starting KDE Plasma 5 Workspace
After installing KDE Plasma 5 Workspace (`x11/plasma5-plasma-workspace`) either via ports or packages, you must also install SDDM.