On the Tools toolbar, chose
the Move tool 
.
Place the cursor inside or on the marquee, hold down the right mouse button, and then drag the marquee to a new position.
After you make a selection in your image, you may want to modify or edit the selection borders.
To change or fine-tune the area the selection encloses, you can use the Move tool to move the marquee.
To move the selection marquee:
On the Tools toolbar, chose
the Move tool .
Place the cursor inside or on the marquee, hold down the right mouse button, and then drag the marquee to a new position.
The selection marquee is normally visible. Sometimes when working with a selection it is helpful to hide the marquee temporarily without disabling the selection. For example, you may want to see the results of pasting a selection or feathering a selection’s edges.
To hide or view the marquee:
Choose Selections > Hide Marquee or press Ctrl + Shift + M.
Sometimes the easiest way to select a complicated part of an image is to select the part of the image that you don’t want and then invert the selection. For example, if you have a picture of a person against a solid color background, you can select the background and then invert the selection to select the person.
To invert a selection:
Make a selection in the image.
Choose Selections > Invert. The marquee changes to enclose the opposite area of the image.
Converting a Selection into a Layer
Creating Custom Patterns from Selections