If you want to fill an area with a solid color, you can use the Rectangle Tool (M). To fill an area with a gradient, first create a Gradient Tool (G) and then click on the gradient bar at the top of the window. To fill an area with a pattern, first create a Pattern Tool (P) and then click on the pattern bar at the top of the window. To fill an area with a gradient or pattern, first select the Gradient or Pattern Tool, and then click on the gradient or pattern in your document. ..