To add a new subscription:
Locate the Subscriptions tab on the sidebar menu
Click Add new subscription
Select type of subscription, start date, and length and click Next
Follow the instructions to make payment. You will need your Invoice ID displayed on the screen
Click Upload payment receipt and upload an image of your receipt
Once approved, the subscription will be approved
The subscription will start around midnight of the subscription's start date. After which you will have access to use all of the subscription's upgraded features