Done my way
In this tutorial...I will show you how to make + add colour bubbles onto your layouts/blends/ect.
First, pick an image.
I am using this one:

Now press the Paintbrush on the Toolbar on the left side of your PSP9
At the top, there will be a toolbar regarding the paintbrush. Change the settings to this:
Pick a Circle Brush
Shape: Cirlce
Size: 150
Hardness: 0
Step: 32
Density: 100
Thickness: 100
Rotation: 0
Opacity: 100
Blend Mode: Normal

Then, make a new Raster Layer by going to Layers >> New Raster Layer
Then pick a colour, and add the brush wherever you want.
Then, once you have done that, double click on "Raster 2" and set the Blend Mode to "Screen"
Now you are done! Here is mine: