Configuring Customer Accounts
From Spiffy Stores Knowledge Base
When Customer Accounts are enabled in your theme, you will see the various settings for this feature on the "Checkout & payment" settings page.
The first option allows you to choose whether customer accounts are enabled for your store, and if so, whether they are require or optional.
By default, customer accounts are disabled. Enable them here if you want to allow your customers to create accounts, which they can then use to manage their contact and address data, and to view their orders. Customer accounts are also required for other features, such as account credits, wholesale prices and customer-based shopping cart and coupon code discounts.