Samsung rs2577sw Refrigerator

Question

the temp adjustment on the front display panel ranges from 34 - 46 degrees. currently. a tech came out a few years back and made the adjustment for the settings which he changed from whatever the org factory settings were. the reason he changed it was that milk, water, and things in the refer side were not getting cold enough. I saw him hold down a couple of buttons on the front panel to make these changes. I would like to adjust the temperature down (colder) a few degrees more to 32 or 30 degrees.Can you please tell me how to do this