If you’re like most people, you probably use Photoshop to edit photos and create graphics. But did you know that you can also use Photoshop to add guide lines? In this tutorial, we’ll show you how to do it. First, open a photo in Photoshop. Next, select the Pen tool (P). Now, click and drag the cursor over the area that you want to add a guide line to. When the cursor changes shape, release the mouse button. You’ll now see a blue guide line appear in the selected area. To remove the guide line, simply select it with the Selection tool (S) and delete it. ..