Use the Yarn Selection dialog box to choose a color and width for your yarn. The length of yarn needed for the line or shape is displayed.
Use Edit Points 
to select a piece of yarn on the work area for editing. See Edit Points.
Color
Choose a color in the Colors dialog, or select a color and theme from the Quick Colors. Click the drop-down color menu to choose a color in the Colors dialog, or pick a Quick Color.
Click the drop-down menu to the right of the Quick Colors to see other Quick Color themes, or to create a new theme.
See Colors Dialog Box and Quick Color Themes.
Size
Select the yarn width from the drop-down menu.
The available sizes are 1mm, 2mm, 3mm, 4mm and 5mm.