iOS version 2.1
To subscribe to revel premium, go to library view by tapping the bottom left icon, at the bottom it will say up to date on the left (unless it is updating) and xx uploads remaining on the right side. Click on the 'uploads remaining' and you should get a page that allows you to upgrade to either a monthly or annual premium subscription.
You can subscribe to Revel Premium by clicking on the Gear Icon and selecting "Subscribe" then select the country or region of where you are located. The option of choosing either a Monthly or Yearly subscription is available.
You can subscribe to Revel Premium by swiping from the right edge of your screen, or by dragging your mouse to the bottom right and selecting settings-->my account-->subscribe.
Mac users can go to adoberevel.com on a browser to subscribe as mentioned above.