Complete Novice getting frustrated!

Arduino: 1.8.13 (Mac OS X), Board: “Arduino Uno”
Hi, I am a complete novice to any type of programming and after some success yesterday making LED flash today I have the following error message. Using a mac book pro which has no USB port so have a dongle type thing linking to Arduino uno.
any help would be appreciated.

Blink sketch works by the way!
Luigi

Sketch uses 946 bytes (2%) of program storage space. Maximum is 32256 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes.

Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_recv(): programmer is not responding

This report would have more information with
“Show verbose output during compilation”
option enabled in File → Preferences.

Do you mean a usb 3 adapter ?

Yes these later MacBook Pro do not have a usb!

Try this: