Hi,
The HikaShop login/registration form is displayed by the file "login" of the view "checkout" that you can edit via the menu "Display > Views".
If you want to remove the registration/login form of the checkout of HikaShop, you can remove the view "login" from the "checkout workflow" option of the configuration.
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.