Scrot : is easy to use and you cam use this to take a picture of the whole screen, this will be useful going forward with these posts.
pkg install scrot
For basic usage just type scrot at the console or in a terminal window.
I have also installed simpleviewer, with
pkg install simpleviewer
However running this at the cli did do anything, you need to find the actual binary executable for this.
info -lx simpleviewer
reveals sviewgl as the program you need to run.
I am now pretty much set up for taking screenshots and being able to view then.