Adding bleed in Illustrator is a simple process that can add a touch of realism to your illustrations. To begin, select the area you want to bleed and then use the Bleed tool on the left-hand side of the screen. To create a basic bleed, drag the slider to the right until you reach your desired level of bleed. To add more detail or color, use the tools on the left-hand side of the screen to adjust how much bleed you want and then click OK.