3 radio buttons in settinglist?

[chishti.hameed]

I'm able to create settinglist with 2 radio button choice.
but when i try to add 1 more radio button,
it's not available in settinglist....

I want to choose 1 radio from 3 total.

helpppppppppp

[chishti.hameed]

found my mistake :-)

[bingxuewangzi427]

how to do it? I get the same problem