How do you change the sales tax amount on a Royal Alpha 9170?

using the MA key switch to PRG. for the first tax rate do the following.

enter number 1, enter PO key,enter tax rate (for example for 8.5% 85000),enter number 1,enter single 0 twice,enter the department number you want to assign to that tax rate,enter single 0 4 times,enter number 1,enter void key, enter AMT TOTAL key.

switch the MA key to REG and make sales