Log in to your account using your Administrator account. 

Select 'Account' at the top of the page

Select Account>Billing from the left navigation menu

Click on the green 'Change Plan' button.

Select the Plan and subscription term (Monthly or Annual) that you want.
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Read our Terms of Agreement and click on the checkbox if you agree.

Finally, click the green 'Confirm Change' button at the bottom of the page. You can view your new subscription on the Billing tab. The new price will go into effect on your next renewal date.