There are a few ways to change the blending mode in Photoshop. The most common way to change the blending mode is to use the blend tool. To use the blend tool, click on the black or white area of your image and then drag it to the right or left to change the blending mode. There are three types of blending modes: additive, subtractive, and multiply. Additive blending modes add together all of the colors in your image, while subtractive blending modes subtract one color from each other and return the result to your image. Multiplicative blending modes multiply all of the colors in your image together.