Hi,
What is the "Login and Registration page" for you ?
HikaShop has no such page.
HikaShop has a registration page. You can access it by creating a menu item of the type HikaShop user registration page via the joomla menu manager.
By default, this page will only have the registration form, no login form.
And similarly, Joomla has a registration page which you can aslo create via the Joomla menu manager with the type Users registration.
And Joomla also has a login page which you can also create via the joomla menu manager with the type Users login.
But neither Joomla nor HikaShop have a page which displays only both the login form and the registration form.
Also, HikaShop has a checkout system, where you can configure several views. Among these views, you have the "login" view which can be configured to display only the login form, only the registration form, or both based on the settings under the Checkout tab of the HikaShop configuration page:
www.hikashop.com/support/documentation/5....html#checkout_login
Are you talking about the login/registration in the checkout of HikaShop ?
If so, then I would recommend you read about the details of each setting in the link above.
The "Display method for registration" and "default registration view" settings should allow you to do what you want there.