What happens next?

How to disconnect a washing machine
Turn off the water valves.
Valves for the supply of hot and cold water are usually located behind the washing machine and in a washer box attached to the wall. Turn off the valves by turning them clockwise until they cannot be turned any further.
You'll want to turn these off first thing. This will protect you from major spills if you should accidentally tear a hose in step 2.