How do I disable the Doro Assistance alarm?

My brother's phone was set up to send alerts to my phone when he presses the alarm button on the back of his phone. Unfortunately he sets its off by accident several times every week, but doesn't remember to use it when he really has an emergency. I can't find any way to turn it off. 

Hi Cherry. Open the Menu -> Settings -> Assistance button -> Assistance button configuration -> Off. Hope that helps.

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