Registration Placeholder doesn't work

-- HikaShop version -- : 3.4.0
-- Joomla version -- : 3.8.6
-- PHP version -- : 5.6

Hi,
How is it going? Thanks to the Hikashop for new improvment in checkout steps.
1-I’ve set registration on “Simplified registration with password”
2-I Went to “Hikashop\Display\Custome fields” and wrote Placeholder for every fields.
The problem:
When customer added a product to card and try to checkout, Placeholder for top registration form is gone.
I can’t find were can I create placeholder for “Email” and “Password”!!! (screenshot attached)
*You can not imagine which ways that I’ve tried and failed. Even changing Joomla’s registration form!.

Hello,

Registration fields are not Hikashop custom fields, so the best solution will probably be to directly edit the ode of the "sub_block_login_registration" file of the "Checkout" view of your front-end template via "Hikashop->Display->Views".