How do I upgrade my subscription?

Settings > Manage Subscription > Select Preferred Subscription Type > Input CC

Go to your "Settings" page under your profile

Select "Manage Subscription" 

Proceed with the Subscription plan you would like to purchase (make sure to also look at the annual subscription options for better value)

Input your CC details to upgrade your subscription plan! It will automatically prorate your subscription based on number of days you have used your current subscription.