What NHN means is the plug does not split.
You have to remove the pins(together with wires obviously ! ) from the plastic plugs and then re-insert them into the correct plug.
To do this you need a special tool or a jewellers screwdriver pushed into the plug to press down the locking tab on the pin.
If you have never done this before then I would suggest an airbag connector is not the one to learn on !
Before you try it, make sure you have drawn out where the wires go so you don't get them swapped over and don't draw the diagram from the front of the plug and then read from the rear when inserting !
Sorry to state what may be obvious to you but it sounds as though you may be a bit 'new' at this sort of thing.