Even though the customer can create the account from the Storefront, the administrator can create the account from the admin panel as well. You can add a new customer by clicking on the Add New Customer button in the Customers page (Customers | Customers | All Customers):
You will be redirected to the New Customer page:
We will add just the basic account information for the new customer:
Associate to Website: Main Website
Group: General
First Name: Your first name
Last Name: Your last name
Email: Your e-mail
Send Default Email from: Default Store View
Now, click on the Save Customer button on the top-right corner of the screen. You will be redirected to the Customers page, and you will see the success message as confirmation that the account has been created: