How do I enable customer accounts on my theme?
Customer accounts are a core feature of Shopify and are not theme specific. You can make customer accounts required or optional, or disable them altogether. When creating an account, customers are redirected to a separate account creation page. Keep in mind that requiring customers to create accounts might decrease sales conversions.
From your Shopify admin, go to Settings > Checkout.
In the Customer accounts section, choose a customer account option. Click Save to confirm your customer account settings.
Your theme will then show the customer accounts options at the top of your site.
Learn more about Shopify Customer accounts at the Shopify Help Center.