We do not handle sign ups / logins on our end.

Due to our privacy policy - we do not store any of your customers details.

You can allow customer sign ups through Shopify, as detailed on this guide:

https://help.shopify.com/en/manual/customers/customer-accounts

Want to customize your login / sign up page? follow this guide:

https://support.apphub.com/en/articles/6269073-how-to-customize-your-sign-up-form