You will use the Iillustrator file you have downloaded as "Layer 1."
Directions for completing Adobe Illustrator Practice 1-5
Create a new layer (it will be called "Layer 2") by clicking on the New Layer icon at the bottom of the Layers Pallett.
Draw on Layer 2 (Layer 2 must be highlighted in dark blue like the illustration above).
Open the Illustrator tutorials file (ill-tutorials-1 to 5) in Adobe Illustrator 10.
Lock Layer 1 by clicking in the box next to the eye in Layer 1. An icon of a padlock will appear that tells you that the layer is locked.
You can make Layer one invisible by clicking on the eye; clicking on the eye again makes the layer visible.