Hello,
Since you're using HikaShop 3.5.1 I would highly recommend you to use the new cart and the new checkout system.
By disabling the legacy features you will have access to the new features ; including a whole new checkout workflow interface which allows you to set-up the names for the different steps.
www.hikashop.com/support/documentation/5...html#advanced_legacy
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.