Casio Parts Cash Register PC Desktop "5002" Questions

...3 key then press subtotal , press numbers 0125 press subtotal, press 3.00 press cash tender key, 5002 cash subtotal example

...FOR TAX TABLE TWO, 0325 FOR TAX TABLE THREE) 4. PRESS TAX% (8.25% IS 825) AND CA/AMT TEND 5. PRESS 5002 AND CA/AMT TEND 6. PRESS SUBTOTAL and it still doesn't work. Any solutions to this?