Turn off the shutoff valve to the dishwasher and be sure you know where your main shutoff to the home is please.

Get warm air blowing on the pipe where it froze before the pipe bursts.

Keep sink cabinet doors open and DW open to allow the warmer air in the room to circulate into these spaces. Good luck!

Turn off the pressure to the unit and check every other faucet and shower/tub control. Be ready to deal with water when the supply line thaws. It could be ruptured and won't leak until it thaws.

set the other faucets in your house to a slow drip to keep the water moving in the system