How to Align and Distribute Layers in Photoshop Elements 11
With the Move tool selected from the Tools panel, click the Align option in the Tool Options and choose an alignment option.
Elements provides you with handy little icons that illustrate the various alignment types.
Note that, depending on which alignment type you choose, Elements aligns to the layer element that’s the farthest from the top, bottom, left, or right. If you align to the center, Elements splits the difference among the various layers.