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Did you get your USB UART already?
You have some little pin cables?
If you have some male ends you can stick them in the holes and apply a bit of side pressure (like taping down the wires a bit) to make contact.
The square hole is probably ground, but check first.
If you have a voltmeter measure each pin vs the sheet metal shields.
Two pins will probably show ~0V and one will show 1.8V.
That's probably device TX, it will connect to RX on the USB UART.
Connect ground to the square hole (as long as it didn't measure 1.8V).
Reboot and see if you see data (using Putty or a terminal program) at 115200,8,n,1
On the left side of the board, the similar 2 pin layout is probably for EDL test jumper.
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