In
the drop down menu, you can select your brush and set its size (master
diameter). You can also adjust the size quickly by using the [ and ]
keys.
Once
your brush is selected, click once to "stamp" the image on your blank
layer. Click and drag to "paint" with your brush using your foreground
color.
Tips
Be
sure to play with the settings in your PS Brushes Palette (Window >
Brushes), or in your PSE "More Options" drop-down menu on the options
toolbar. You can adjust the angle, size, spacing, and so much more.
Brushes can also be used with many of the painting and retouching tools, such as the Eraser, Pencil, and Clone tools.