How to change ';timing'; of Nikon D40 Display Screen?

I have a Nikon D40 and I can't figure out how to increase the ';timing'; of the display screen. When I'm trying to change settings or make changes, the LCD screen goes black after about 5 seconds. I know that it does this to save battery power, but I want to increase the time to say 10 seconds. Does anyone know how to do this?How to change ';timing'; of Nikon D40 Display Screen?
Page of 78 your manual:

http://support.nikontech.com/app/answers



under the setting of ';auto off timers';

You can set the monitor and image review to 4,8,20,60 seconds or 10 minutes

and meter to 4,8,20,60 seconds or 30 minutes