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How do you change the tax rate from 17.5 to 15% ?

How do you change the tax rate from 17.5 to 15 using only the keyboard and without using the programming software?
Page 80 of the manual says about tax shift button, which is what exactly?
Neal, December 2008
Sorry should have mentioned it is for a Sam4s ER5200M cash register that the above question applies to. Thought this printed with question!

Neal,, December 2008