Need help to reduce commercial fridge temperature using thermostat (with pictures)

Hey guys, so I want to reduce the temperature of our refrigerator but I am not sure how to work the thermostat to achieve this. Images below :)

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https://i.imgur.com/ych3hsW.jpg

https://i.imgur.com/v03yOD8.jpg

https://i.imgur.com/AxEfEyO.jpg

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Your help will be much appreciated.

submitted by /u/dcba195
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