How to Use the Photoshop Marquee Tool

Once you have selected the marquee tool of your choice, you can select an area of the image to work with. Position the mouse where you want to begin the selection and click the left mouse button, holding it down while you drag the selection to the desired size, and then release the mouse button. For the “single row” and “single column” marquees, click and drag the marquee to select the one-pixel line of your choice.