Custom fields data can't be saved

-- HikaShop version -- : HikaShop Business 2.6.3,
-- Joomla version -- : 3.5
-- PHP version -- : 5.12.12

Hi,
I new a product custom field for user to put their video clip from youtube, the input format is like :
<iframe width="560" height="315" src=" www.youtube.com/embed/fvEZUbzqqyM " frameborder="0" allowfullscreen></iframe>

I have two questions here :
1. Should I set the input type as text or WYSIWYG ?
2. Currently I set it to be text, but after I save the input, and reopen the product, It just didn't have into the field, no matter I use the front end or back end product edition page.
3. I will show the result into the show_tabular, and I have added a video tag, but I don't know what attribute in $this->fields->vedio that content the HTML code maintained above. ?
Thanks

Best Regards

Sorry, I forgot to attache the screenshot.
As you can see, I have set 2 custom fields, the first one is a radio button type, the data was saved, and the second one is the video one, it showed no data.


Best Regards

Hi, I just saw the data should be saved in
element->video,
But I still have problem save data into this custom field fro ether front end or backend

Thanks
Best Regards