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How to add radio button in data list after clicking new item button.
You cannot "add a radiobutton after click new item button". All the forms for data list items are pre-defined - the end-user cannot simply add a new field. You'd need to provide a custom data list model as an extension alongside the relevant form configuration to add a custom type of data list that then contains a radio button - for whatever you want to use it for.
In the future, providing as much information about your use case will help ensure you get good answers.
guide us how to add radio button in custom datalist
Please workl through the documentation on data list extension. I'd be happy to answer specific questions / help with specific problems afterwards...