You may find it that you'd want to add products one at a time based on your business need. To do so, please follow the instructions below:
1. From your Main Dashboard hover over the Account tab and select My Account as shown in the image below.
2. Once on the My Account page select the Billing/Subscription Details tab and then click on 'Manage Plan Details' link on the right side.
3. Scroll down to the Additional Purchased Items section and click on +Buy More of the service that you wish to purchase.
Note: To remove the products from your subscription, click on Cancel/Deactivate button of the service that you wish to discontinue.
4. Confirm the quantity of the product you wish to get subscription for and click on Proceed to Checkout.
5. Fill out the Billing Information and agree the Terms & Conditions before clicking on Confirm Order button.