Off to your right, you'll see a long, vertical window labeled "Toolbar". To select a tool in each category, click on the category and hold your click. Sub-tools will then be listed beneath it. Bring your mouse pointer to the tool you want, then release the click to select it.
The first set of tools include the "Pencil", "Watercolor", "Airbrush", "Pen", "EPen", and "Mosiac".
Click on "Pencil" and hold to see the other tools appear. I've demonstrated each tool in the picture below.
To the left, I made a scribble using the tool at maximum Alpha, then wrote the name of the tool next to it, same Alpha. To the right of the name, I gradually decreased the Alpha to show how it changes when the Alpha is decreased.
The Alpha is found below the color swatches(grid of square colors). It says A255 when you have the default "Pencil" tool selected. 255 is the maximum value. Selecting anything less will make the color more see-through.
As you can see, with each decrease of the Alpha, the black becomes more gray, and less visible. Experiment with this to get the hang of it.
On the bottom left, there is the "EPen" tool. I have no idea what this is for. It looks like it makes some sort of dusty texture.
On the bottom right, I have drawn a smiley face with the "Pen" tool. I used the "Copy" tool to duplicate the smiley face. I then selected the "Mosiac" tool to censor it. That's all that that tool is for, really.
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