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Hi Miguiach, those terminals are spring loaded, you must insert the cable under pressure or on the plastic flap make a small pressure so that it opens and you can insert the tip of the cable. I hope it is helpful!
Greetings. In the first case you should press the lever that appears on the right, just where it indicates A1 and A2. When you press the lever you will notice that the top hole where the cables or connectors go will open slightly.
In the second case you must press with a screwdriver fine tip on the top to open the connector. Each terminal is independent.
I hope to help you.