Using a Custom Class on your Nintex form label control
If your label has a custom class, such as CSS class property then apply
Label control name is LabelToolTips
Use in the following code on your code logic
NWF$('.LabelToolTips').css('border', '2px solid #ff0000'); // Red border
NWF$('.LabelToolTips').html("*If you are unsure, choose Intranet Issue"); //Apply Value
NWF$('.LabelToolTips').css('border', 'none'); // Remove Border