can't to used others register plugin?

-- HikaShop version -- : HikaShop Business: 3.2.2
-- Joomla version -- : 3.8.5
-- PHP version -- : 5.6
-- Browser(s) name and version -- : IE / safari
-- Error-message(debug-mod must be tuned on) -- : can't disable register form?

I had easy profile & hikashop，but user register always used hikashop ?
I disable hikashop login still can't used another register form?

Hi,

The checkout requires the registration form to be done in a certain way. It's not possible to integrate inside the checkout another registration form than the one from HikaShop.
With some customization, you can potentially remove the HikaShop registration form and add instead a link to the registration form you want so that the customers can click on the link, but it will break the flow of the checkout for them.