Step 1: Adding fields to Register Form

#1 Make sure that you are using Wilcity Child Theme and have knowledge of PHP and WordPress.

#2 Put the following code to functions.php of Child Theme (Example)

add_filter('wilcity/wiloke-listing-tools/filter/configs/register-login', function($aFields) {
	$aRegisterFields = array_merge($aFields['register'], [
		[
			'type'        => 'wil-input',
			'label'       => 'Input Field',
			'name'        => 'input_key',
			'isRequired'  => 'yes'
		],
		[
			'type'        => 'wil-checkbox',
			'label'       => 'Checkbox Field',
			'name'        => 'checkout_field',
			'trueValue'  => 'yes',
			'falseValue'  => 'no',
			'isRequired'  => 'yes'
		],
		[
			'type'        => 'wil-radio',
			'label'       => 'Radio 1 Field',
			'name'        => 'radio_field',
			'trueValue'  => 'agree_to_term'
		],
		[
			'type'        => 'wil-radio',
			'label'       => 'Radio 2 Field',
			'name'        => 'radio_field',
			'trueValue'  => 'not_agree_to_term'
		],
	]);

	$aFields['register'] = $aRegisterFields;
	return $aFields;
});

After adding this code, your form will look like this

Step 2: Updating Form Data

To update the data, We use this hook

do_action('wilcity/after/created-account',
	$userID,
	$aData['username'],
	$needConfirm,
	[
	     'isApp'     => false,
	     'loginWith' => 'wp'
	],
	$aData
);

You can use the hook above to handle with custom fields after register.
For example:

add_action('wilcity/after/created-account', function ($userID, $userName, $needConfirm, $aLoginWith, $aData) {
   //Handle after register here
},10,5);