photoshop, how to change the background color it?

I would like a picture into the background color white, how it changed? If so, can the steps as well clarify this.

paint bucket tool can be used, the more you try, at the same time together with lasso tool click on the background of some of the more beautiful layers in the toolbar to see the black layer in the layer, which, ALT + DELETE is the replacement of the former Layer, CTRL + DELETE is to replace the background layer.Picture background color is the color? Deduction to figure out, and then to click on a white background to fill the background layer, put it into white.