kde5 plasma-desktop plasma5 area51

I try to using X11/kf5-frameworks but it's not a full kde5 meta. And I can't using it. It even can't start by "startx". And I want to try using this way: https://community.kde.org/FreeBSD/Setup/Area51 but I don't know what is jail, like docker? I just want to install KDE 5, I don't want to...

The experimental area51 repo has dissapeard from area51.pcbsd.org for no officially disclosed reason. https://mail.kde.org/pipermail/kde-freebsd/2017-May/026024.html https://mail.kde.org/pipermail/kde-freebsd/2017-May/026028.html However, the KDE Framework 5.3 has officially landed in ports...