This is a quick how-to when it comes to upgrading your subscription.
Go to http://office.com
Login
Click the Admin link
Navigate to Billing on the left and select Products & Services
Click on your Office 365 Subscription, in my case it is Office 365 Business Premium
Select Upgrade from the menu at the bottom of the screen
Find the plan that works for you. For me it was Microsoft 365 Business
Click Upgrade
Select the Billing cycle (Monthly or Yearly)
Click Go to checkout
Verify your billing information
Click Place Order
Your order is now complete and you can proceed to setting up the new features
