layerslider navigation trigger/wait for trigger

Hello, I want to add one more item to the slider - but I don’t know how to hide it in the slider, I mean, when I want to hide it I press the button, than it has to disappear, I have learned that this is made with “wait for trigger” and “trigger memory” but I have forgotten, how I can active trigger.

Could someone show me, how I can add these two objects.

Greetings Selma