How to white balance with nikon d5000?

I'm new to photography and trying to get better but everytime i do a photoshoot with my white back drop the back drop come out more yellow than white how can i fix this problem

Take a look here:

The second menu entry on the right bar on the LCD (currently set to "WB auto") is the white balance menu, there you can adjust your white balance. Set it to the correct source of light in your situation.

The best way to fix that is using editing software after you download your photos to your computer. In your editing software, just select your white backdrop as the white point in your photo.

Have you read your owner's manual? Why not? Details are always there.

Crank open the owners manual on the chapter of whitebalance. Get a piece of white paper and shoot a custom whitebalance.

What are you lighting your white backdrop with? Flash? Continuous lights? Nothing?

Auto WB should correct for most things but you may need to do a custom white balance if you are shooting an unusual light source. Check your manual for how to shoot a custom WB.

Or shoot in raw and adjust WB in post.

Your problem is the light source. If you can tell exactly what kind of bulb it uses, match it with the White Balance setting on the camera. If you can't tell, try Auto. The camera usually gets it right. If not, experiment. If all else fail, change the lighting.

I once had a shoot that got me going crazy. Subjects were turning up yellow to bronze and I was shooting with the sun. The problem turned out to be the floor tiles which was easily fixed by covering it up with newspaper.

Probably means you are shooting with incandescent lights. If so, set your camera's white balance to incandescent. If this doesn't help, then do a custom white balance. Your manual has all this information under "white balance" on page 96.

Another thing you can do is use a fixed white balance setting which is close to what looks right. Then, shoot a grey card so you can custom white balance in a photo editor.