To use the marquee tool in photoshop:
open a picture: file –> open
Select Marquee tool: hold down the left click over the marquee tool to change from an elliptical, square or column.
Bring the mouse over to your image and highlight the area you need to move. To highlight the area, left click and drag over it. When you are satisfied release the left click.
Now hit the letter v on the keyboard to activate the move tool. Now you can move what is inside the marquee tool.
Left click inside the marquee tool hold shift and drag it over.
This is how you use the marquee tool.
You can watch a tutorial on how to use this tool along with other tools in photoshop by going to www.cdesign8.com Sign up for the quick start tutorial .