In Elements, there’s a simple way to straighten photos, but it’s knowing how to set the options for the tool that makes your job dramatically easier. Here’s how it’s done:
Open the photo that needs straightening (the photo shown here looks like the horizon is sloping down to the left). Then, choose the Straighten tool from the Toolbox (or just press the P key).
Take the Straighten tool and drag it along an edge in the photo that you think should be perfectly horizontal, like a horizon line (as shown here).
When you release the mouse button, the image is ...