Working with Graphics - Adobe Illustrator CS6 on Demand - page 552

Select the Appearance panel.
The currently targeted layer appears in bold with a type name at the top.
Click Fill , Stroke , Opacity , or other available attributes to display a panel with
options.
Specify the options and values that you want to set for the attribute.
To apply multiple fill or stroke attributes, click the Add New Fill or Add New
Stroke button on the panel.
To show or hide attributes, click the Visibility column for each attribute.