make sure the focus is on the table, not VPM, and hit the "print screen/sysreq" key next to the "scroll lock" key on the keyboard. open up graphic program of choice and then choose "paste". save your file in a compression format like JPG if you intend to paste it to webforums like this.
or use any of the screenshot capture utilities out there (google, etc)- they will automatically save the screen to a file whenever you hit a certain key combination.