Cafeteria Plan deduction question

I can not get my payroll module to do our cafeteria plan pretax for our employees that are enrolled in the company. I have it set up in my payroll module, but it's looks like it still taking taxes out. I can not get my user guide to work. Ever since I went From Peachtree to Sage 50, my user guide has never worked, so I've never been able to look up any question there.