How can I set correctly the temperature controller of RT38F Refrigerator?

If the Refrigerator is installed the first time, it is recmmended that the freezer's temperature controller is set to Level 1 (MAX Refrigerator Cool) for 1 day. After 1 day, adjust the Freezer Controller to Level 5.

If it is summer (ambient temperature is 35 degree celcius), it is recommended that freezer controller is set on  Level 1 - 5 and R controller is set on Level 6 (1 degree celcius).

Note: Freezer Controllers Temperature setting affects the whole cooling of the Fridge.