How do I reset my water ionizer?

How do I reset my water ionizer?

https://www.youtube.com/watch?v=WxMFF6EbeEc

What does an ionizer do to water?

A water ionizer (also known as an alkaline ionizer) is a home appliance which claims to raise the pH of drinking water by using electrolysis to separate the incoming water stream into acidic and alkaline components. The alkaline stream of the treated water is called alkaline water.