To change your plan:

1) Log in to your account

2) Click on "My Account"



3) On the Left Side-bar, click on "Plan & Billing"




4) Click on "Change Subscription"



5) There you will see a drop down with an option to switch plan.




If you are not seeing this option on your account, you are most likely not logged in as the administrator, but as a sub-user. Try to log into the dashboard using your administrative account information and you should see the subscription area.