Dishwasher mid-cycle manual fill - possible?
Most dishwashers have a "cancel" option to end the current cycle and start over. Consult the manual, perhaps? Unfortunately what I've been able to find for "online" manuals for this model appear to be from very sketchy sites that don't load, perhaps you have a paper version that's 12 years old?

If no luck there:

Try turning the circuit breaker feeding it off for a minute or more.