1 – Log into the Stores PrestaShop backoffice.
2 – On the lefthand menu click on customers
3 – On the customer overview page, click on the ‘Add new customer’ button on the top-right of the browser
4 – Add the relevant details for the new customer selecting the required customer groups
5 – Once the details have been added, click save at the bottom-right of the page and you’re done.