Nikon D80, the LCD screen, can it be used as view finder besides the viewfinder?

I have just purchased a Nikon D80 and I'm reading the manual briefly but can't find anything about the LCD screen being used to view the composition. If I can use the screen which I thought i could before i bought it, how do i turn the display screen on. I know how to display the photos i've already taken (viewing them on the LCD. Or looking at the menus etc. Does the D80 do this or do i have to take photo's only through viewfinder?

No it doesn't function as a view finder.
The next camera the D90 does have this capability. I also have a D80 and love it. The D90 came out 1/2 year after I bought the D80 years ago. The D90 has video which for me I prefer to buy a sony video cam. I'm from the old school. Started photography 40 years back with a Nikon F. You could literally use them as a substitute for a hammer. I'll never forget the day I went down to Bestbuy and picked up the D80. My first wake-up reaction was 'it's plastic?', and the lens wobbles slightly. The sales man just gave me a blank look.
Then I remembered field cameras also have movable lenses, so no big deal.
But after getting used to it I was amazed of what I could do with it that I couldn't do 40 years back. I stopped for a 20 year period and had a lot of catching up. Good luck, have fun. If you have any D80 questions email me through my profile thing.
Back then we used wide angles to capture large scenes which we ended up with extended distortion, being the background seemed much further back than normal view.
These days we can shoot multiple shots of an entire scene with a normal lens from one side to the other and then edit them into one wide view shot with no distortion.
Check this out for fun, Paris in 26 GigaPixels. It's an incredible wide angle shot using about 1,000 shots taken with a medium telephoto, (I'm not 100% sure on the amount of shots or lens);
http://www.paris-26-gigapixels.com/index-en.html