Hello ,
thank you for providing this question.
I am a seasoned Windows expert with almost a decade in usage and support experience and hope to resolve your problems quickly.
The button used to switch the radio buttons on/off once selected is space.
If this solved your problem i am very happy if you would provide feedback or mark this as solved.
If this didn't solve your problem or you need further assistance please answer in this thread and i will be happy to help.
kind regards
F. Grobusch