Edit, Canvas

Image, Canvas Size

Command T 

Command D

Use the magic wand

Use the Lasso Tool and copy and paste

Edit, Fill, Content-Award Fill

Leave the squirrel

hold the Hand tool to reveal the Rotate tool. Click and drag to rotate the image until it looks straight.

Retake the picture

Crop tool, then from the Options bar, choose the Straighten tool. Drag a line across the horizon, and the image will rotate along the line you drew.

Use the crop tool and crop until it is vertical

B

A

C

D

A

B

C

D