Add Fields on Checkout process

-- HikaShop version -- : 2.3.5
-- Joomla version -- : 3.2.0
-- PHP version -- : 5.4.0
-- Browser(s) name and version -- : Google Chrome 40.0.2214.91

Hi,
I am sorry my bad english...I will try to explain.
When client is in checkout, hikashop asks only email. But i need it asks name and telephone too, but without register it.
How can i do this, please?

Tks.