Hi,
The view is "checkout | login".
If you do not want to use the radio in bootstrap mode (with the bootstrap design activated in HikaShop), you can replace
echo JHTML::_('hikaselect.radiolist', $values, 'data[register][registration_method]', ' onchange="displayRegistration(this)"', 'value', 'text', $defaultSelection, false, false, true );
By
echo JHTML::_('select.radiolist', $values, 'data[register][registration_method]', ' onchange="displayRegistration(this)"', 'value', 'text', $defaultSelection, false, false, true );
It will use the default Joomla radiolist instead of the "hikaselect" override for bootstrap.
Regards,