Select the background using the wand and lasso tool. I don’t want to make this process sound easier or harder than it is—the amount of work depends on the image you’re trying to edit. There are many tools in Photoshop that can be used to select areas of an image.
The Wand Tool
The magic wand tool is designed to automatically separate objects. The software tries to automatically detect the edges of an object to create the selection. This tool works best on areas with solid color and little texture.
Select it in the left-hand toolbar or press W on your keyboard.
The Lasso Tool
This is my favorite tool—by far. The Polygonal Lasso tool lets you draw a selection by clicking the mouse to drop points. The regular Lasso tool is used to freehand draw custom selections.
Select it using the toolbar on the left or press L on your keyboard. Hold Shift while using it to add to a selection and Alt to subtract from it.