How to Remove and change Background in Photoshop

1) Launch Photoshop.

2)Open Image.

3)After opening your image select Quick selection Tool shortcut key is (W).Quick selection tool will open,Now click and drag on your body image........ 
How to Remove and Change Background in... by SyedUmarZameer

About Quick Selection Tool
we learned how the Magic Wand Tool works and why it can be a great choice for selecting areas of similar tone and color. In that tutorial, we used the Magic Wand to easily select the clear blue sky in an image, which we then replaced with one that was a bit more interesting. But if any of Photoshop’s selection tools deserve to be called "magic", it’s not the Magic Wand. It’s the tool we’ll be looking at in this tutorial – the Quick Selection Tool. First introduced in Photoshop CS3, the Quick Selection Tool is somewhat similar to the Magic Wand in that it also selects pixels based on tone and color. But the Quick Selection Tool goes far beyond the Magic Wand’s limited abilities by also looking for similar textures in the image, which makes it great at detecting the edges of objects. And unlike the Magic Wand where we click on an area and hope for the best, the Quick Selection Tool works more like a brush, allowing us to select areas simply by "painting" over them! In fact, as we’ll see in this tutorial, it often works so well and so quickly that if you’re using Photoshop CS3 or higher (I’m using Photoshop CS5 here), the Quick Selection Tool could easily become your main selection tool of choice.