Sarah,
In my Canon you just take a pic of the grey card then select that image in Manual WB settings to set the WB. I assume that the D90 will be similar.
I found this on Youtube which covers it for the D90.
[ame=http://www.youtube.com/watch?v=1MQTO9tiXb0]Nikon D90- White Balance - YouTube[/ame]
Or, you could just use RAW mode and adjust the WB during editing.
Cheers,



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