Help on disconnecting the waste pipe of my broken washing machine

hi, i bought a new washing machine and paid an installation service. they require me to disconnect the old washing machine myself.

i am having difficulty with disconnecting the waste pipe and need some help.

1. is the disconnection point the joint that connects the yellow tub?

2. i tried to disconnect using hand but it didnt work, do i need to pipe wrench?

3. i dont have pipe wrench, worst case scenario if i cut off the plastic waste pipe and release water, does it count as disconnecting?

Many thanks in advance!

Alan