cvv tootip / finish checkout

-- HikaShop version -- : 3.2.0
-- Joomla version -- : 3.8.1

1.I want to use cvv tootip that look like in cvv image. Does hikashop has it?
2.I try to buy product by Bank transfer method and found problem. In finish checkout, Massage show that
Notice(แจ้งให้ทราบ)
Could not instantiate mail function
What is that?

Thanks