Help with UR22mkII interphase

Hello, dear friends

I’m very new to this technology, and I’m having problems to set up the Steinberg URmkII interphase in my computer.

I have a Mac Mini with 16 GB RA. Operating System is Sierra

Model: Mac mini
Processor: Intel Core i5
Processor speed: 2,6 GHz
RAM: 16 GB

After setting up the input to the device in my computer, I connected the microphone to input 1 of the Steinberg device, it gets the voice signal from microphone and passes it to the computer: I can talk to SIRI, and also record voice in iMovie.
Problem comes with GarageBand, as it doesn’t recognize the input from the UR22mkII.

I also cannot in any way listen to my voice via the loudspeakers (output is to a Creative System via the headphones connector. I can hear recorded music and videos from youtube without any problem by the loudspeakers.

Can you help me knowing what is wrong?

Thanks in advance for your help. Best regards,

Oscar