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Unfortunately radio buttons are setup to specifically only allow one selection. For multiple selections, using a check box field is a better solution.
You can customize the amount selections allowed and things of that sort as well.
This is very confusing, especially for users like me coming over from Adobe FormsCentral. Why not just label these options "Single Selection" and "Multiple Selection" rather than "radio" or "checkbox"? I just wrote out 33 different options for a question and now I have to do them all over again because I was on radio buttons instead of checkboxes. These should be interchangeable.
You do not have to retype all the 33 options on the Checkbox...
You can just copy them from the Radio option, and paste it to the Checkbox options.
Hope this help also. Let us know if you need further assistance.