Arrange Values
Warehouse->Products->{Click product}->[Attributes] ->{Click attribute}->[Arrange Values]

Overview
Here you can change the order of the attributes values as they appear in the Store section and even in the Admin section.
To change the order of an attribute value you'll have to choose it and click [Move Up] or [Move Down] button.


Elements
{the attributes values listbox}
You must select the attributes values to arrange.

[Move Up]
This button will move up one position the selected attributes values in the listbox.

[Move Down]
This button will move down one position the selected attributes values in the listbox.

[Save Settings]
This button will update the attributes values.

Links
From here you can:

Update attributes values [Save Settings] Add New Attribute page