A customer account gives the customer the opportunity to view their orders (order data, statuses, etc.) and to save their contact details
Make sure you have an Advanced or higher plan if you want to have this functionality. If so, follow the instructions below.
Adding a registration and login option
Go to 'Settings' > Orders > General Order settings > Toggle customer account.
Decide whether registration is required or optional for ordering (the customer decides whether he wants to set up an account or whether to buy as a guest).
Then choose whether or not a customer account will be active as soon as it's set up or will require verification and activation.
Now check if in your store's header there is a register/login link.
If the link is not visible in your store contact us - We will add this element to your theme.