Help with Castellated Holes

How do I do castellated holes in the pcb like the one in uno mini?

Give your KiCad version and we may be able to give more info. There are several details which aren’t in that article ATM.

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Hey eelik,
it’s 6.0.4.

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I have no clue what you talking about. You can’t drill half a hole.

That’s why they first drill, then mill. This is explained in the FAQ article:

Castellation is made so that there are normal PTH pads first and they are surrounded by the board material. Then the board edge is milled or cut in some other way so that half of the holes are left.