Click and drag to select a colour (1). Move the slider (2) to select a different hue. Hex colour values can be typed or pasted into the text box (3). Click the + button (4) to store the colour in the picked colours grid (5). Pick a colour from the colour swatch (6) if you want the colour to change when ever you change the colour swatch. To set the colour to Transparent, click (7).
Click the OK button (8) to close the colour picker and apply the selected colour