To remove the implement simply lift the red pin and slide the implement off.
For each additional implement an additional or blank coupler would be required. The type of coupler depends upon whether the implement is powered or not.
The BCS 660 and 750 power units have inbuilt implement quick coupling, which is a different system to this. See here for details. This also applies to the CAMON C15.
Which power units is the implement quick coupling assembly suitable for?