Hello @Minodora27 ,
I will be patient and help you. The SDK for the K6* chip can be obtained in the following way.

After the SDK is downloaded, it can be imported into MCUXpresso by dragging.

The led_blinky demo can be found in the following way.

Through the example of this demo, you can see its control over the LED GPIO. You can compile this project and try to burn it to see if there are still any problems.

I hope the above information is useful to you. If you still have questions, please feel free to contact me.
Best Regards,
Celeste