Change your document size under the File menu or drag the artwork in using the selection tool
I answered becuase you asked nicely...
Look on the home page
Media Professionals User Forums - More Signal, Less Noise....
This is not a place for questions that would be solved from readingthe first chapter of the classroom in the book or user manual... if you are going to purchase expensive software, be sure to investigate basic funtionalty through training.
Richard M. Harrington, PMP
Author: Photoshop CS for Nonlinear Editors
Co-Author Final Cut Pro on the Spot, After Effects on the Spot, Broadcast Graphics on the Spot, and After Effects @ Work
Check out the new DVD: Photoshop CS: Essentials for Digital Video from http://www.photoshopforvideo.com