I am very new to sing this. But when I plug my Arduino Pro Micro it does not detect it in the software. When I go to the ports it just says COM 3, 4, 5, 6, 7, 8, 9, 10 and it will not show up. It is also not showing up in windows device manager when I go there (as far as I can tell). I am very sorry that there is not very much information but this is all I can tell.
In the picture I have just randomly selected COM 6
The ProMicro requires a double-tap reset to get into bootloader mode. So @kolaha's reply actually requires you to short the reset pin twice in quick succession.
The ProMicro uses a microUSB connector; there are a lot of microUSB cables around that are charge-only and for that reason don't carry the data signals. You might have a cable like that if the double-tap reset does not work. If you have a phone that uses the same connector, you can test the cable as the phone should show up in Windows.