To upgrade your account, first login at  Then click the user icon in the toolbar, Billing, Billing Profile as shown below

The billing profile screen will be displayed with your plan details selected:

To edit your subscription in order to change plans, or add-ons, click the Subscription Plan name (shown as Entry Level Plan above), then click Edit Subscription. From that screen you can change the plan and add any required add-ons:

Plan upgrades are pro-rated for the billing period.

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