If you already have a Business Premium license on your account and you simply want to increase the number of licenses please see the following article:
If however you have your Business Premium licenses and you wish to add a Business Essentials license then please follow these steps.
Firstly from the home page we need to select 'Buy More Services' from the store section.
This takes you to the first screen in the store where you will need to select 'Office 365'.
Then once you click next you will be presented with the available O365 subscriptions for which I have now selected the O365 Business Essentials product and again clicked next.
You are then asked to specify the duration which will always be 1 year with any Office 365 subscription.
The next page you can actually ignore if you already have an Office 365 subscription, simply click next. If however you are using this method to purchase your first Office 365 Subscription then please enter a subdomain at this stage. This subdomain is used to provision your services and you are able to configure your own domain, or purchase a new one, later.
You then reach the final screen where by you can confirm your order details, select your payment method, then click 'Place Order' to start the provisioning of your new subscription. This process usually takes between 5 and 10 minutes but can on some occasions take longer. If you are waiting longer than 10 minutes please feel free to contact our Support team who can verify the progress of your order.