Manage your Cloud Campaign subscription with just a few clicks!
Click your name in the top right hand corner of the screen and select Billing Info in the dropdown.
In the Subscription Plan tab, click Manage.
You can now click on the plan you want to switch over to.
That's it!
Note: You won't ever have to worry about being under or over-charged when switching plans, Cloud Campaign will pro-rate your subscription based on usage for the month.