Port menu is grayed NIBOburger

My NIBOburger is harware-tested and OK.

Adruino.lnk:
Testprogram compiles OK
BUT
Port is grayed.

Verify
Done compiling
Bootloader file specified but missing: C:\Program Files (x86)\Arduino\hardware\nicai\avr\bootloaders\DoNotEraseTheBootloader
(this may be only a warning)
Sketch uses 5316 bytes (32%) of program storage space. Maximum is 16384 bytes.
Global variables use 211 bytes of dynamic memory.
Serial port not selected.

Device Manager recognizes NIBOburger

Windows 8.1 AND on other PC Windows 10

Any idea?????

device mgr Screenshot 2019-02-03 18.49.22.jpg780×564 61.9 KB

Port grayedScreenshot 2019-02-03 18.44.18.jpg540×603 86.7 KB

I just read through this guide, and you don't need to select a port since it seems that the NIBOburger has a built-in programmer.