Currently, if you have an active Pro subscription, you cannot change it until your subscription ends. Therefore, we suggest that you schedule your Pro subscription to cancel, and after the cancellation date, subscribe to a new Premium subscription.
Note: If you have made creations using Pro and you would like to use them without the Smilebox Ending Slide, you must download them to your computer before your Pro subscription ends. Once it does, and you go to the My Creations tab, all your creations will no longer play without the Smilebox Ending, as the removal of it, is a Pro feature.
Enjoy, and remember that if you have any questions regarding your creation, just contact us.