PBase

Hi. I am new to DSLR. I just got my stuff. Photo Studio and Fuji S1 Pro

I know it has the feature to customize the white balance but i dont know how.
I can take it to the WB option. Under the White Ballance, i pick custom. Now from Custom, how do i set the white ballance to " -1" or others. Any help is appreciated a lot.

That's a pretty old camera now, made in 2000. Probably best to read the review here: http://www.dpreview.com/reviews/fujis1pro/
You'll find they have details on how the settings work.