Colorizing part of an image in Paint shop pro

I'm going to change this
first open the pic in paint shop pro and use the magic wand to select the areas to be colorized
(use the tools to change the amount of tolerance to get more or less area)

then right click to copy the selection (then go to selections and choose deselect all) and then right click and choose "paste as a new layer"

Use the layer tool to view only the hair (your selection) if you want

then colorize the hair

use the layer tool to view the new colour on top of the old
if you like it: merge the layers and save!