The palette editor screen allows you to edit the basic palettes the game
works with. The palette to edit is selected on the far left of the dialog.
When editing the main palette, for your convenience the text colour and
BluGlo palette colour ranges are highlighted in black. To edit an
individual colour entry, select it and the right hand portion of the screen
will fill out with the details of the selected colour - it's Hue, Saturation,
& Luminosity values, the equivalent Red, Green, & Blue values, and the
spectrum display will show a cross-hairs at the colour position.
To change the colour either click on a new position on the spectrum square,
or change either the Hue, Sat, Lum, Red, Green, or Blue values directly. Then
click on Save to save the changed colour.