What temp should be set in a mini fridge in order to keep stuff frozen in freezer part?

Since we have no idea what number corresponds to what temperature, how can we even guess?

You need to find whatever setting maintains a freezer temperature of 0F and a refrigerator temperature of 37F.

You can buy a thermometer to make sure your food is safe.

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Try 6 if it doesn’t cool stuff down put it 7 shouldn’t be to cold or even 6 & a half if can

The only "stuff" in a mini fridge that can be frozen is water for ice cubes (28-30° F). You can not keep ice cream and other things hard frozen (-5 to +5° F). Too many people don't understand this. A standard temperature for a refrigerator is 36-40° F.

I have had a few mini fridges and find that usually the freezer doesn't work well, so I just stopped getting them with freezers.

The VAST majority of mini-fridges don't HAVE a freezer compartment.

Dittos to Anon: buy an inexpensive refridge thermometer at the hardward store. Most recommend that the refridge section be kept at around 35-38 degrees (F) and 0 to 10 in the freezer. Almost all fridge controls are inaccurate - set to correct temps using a thermometer.

Set it to the coldest position. No joy, the fridge is broken.

As cold as you can get it without freezing stuff in the fridge part. 0F/-18C is the ideal temp for frozen food. I have mine at work set to 4 on a scale of 1-7 and it keeps stuff in the freezer compartment well frozen and things in the fridge cold, but not icy.