Choose Window > Layers to open the Layers panel. Each new document starts with a single layer named Layer 1.
To rename a layer, double-click the layer name in the Layers panel, type in the new name, and click OK.
To create a new layer, click the Create New Layer button at the bottom of the Layers panel.
To select a layer, select it in the Layers panel. Drag the layer up or down in the Layers panel to change the order of layered objects in the document.
To lock a layer, click the blank area to the right of the eye icon in the Layers panel.