One of the things I had trouble figuring out how to do in Paint
Shop Pro was to change the color of something that was white.
Using the Colorize command didn't seem to do the trick.
On a flat surface with no texture or anything, you can change
the color of the whole layer. Make sure you are ON that layer,
and that it is a raster layer, then, in the layers palette, click
on the padlock to lock the layer. This means only the opaque pixels
on that layer will be changed.
Now you can use your fill bucket to click anywhere on the white
layer. It fills it with your color. However, this would fill over
anything such as texture or beveling.
On a mostly white object you want to recolor (this customizable
mug is in my "Digiscrappin'" page kit), what you need
to do first is to lower the brightness.
You can probably use the brightness controls but I do this by
Adjust/ Hue and Saturation/ Hue, Saturation & Brightness.
I only lower the lightness until it's a medium gray (or darker
if I'm aiming at making my mug dark).
Now you are ready to Adjust/Hue and Saturation/Colorize, to get
the color of your choice, and it leaves the shape and shading
of the object intact.