Place wire appropriately on the guides inside the tray so it runs through both sides of the top of the connector
Push down the tray so it closes with the wires still in the correct position
Using pliers, press hard on the top of the closed connector to secure the wire in place and snap the tray closed
Open the bottom of the connector
Prepare wires to be inserted into the bottom of the connector by cutting it flush with the wire casing
Insert wire into the connector and make sure that the wire is pushed all the way to the back of the connector (critical step)
Once you have confirmed that the wire has been pushed all the way to the back and is lined up correctly press the connector tray down with pliers to secure the connection