In Photoshop, there are a few different ways that you can change the background of a picture. One way is to use the “Background Eraser” tool. With this tool, you can click on the part of the image that you want to remove, and Photoshop will erase it and make the background transparent.
Another way to change the background of an image is to use the “Select” tool. With this tool, you can click and drag around the part of the image that you want to keep, and then delete the rest of the image. This is a good option if you want to keep the foreground of the image intact and just change the background.
Finally, you can also use layers to change the background of an image. With this method, you would create a new layer behind the image, and then fill it with the color or pattern that you want as your new background. This is a good option if you want to completely change the look of the image, or if you want to be able to edit both the foreground and background separately.