Help is here.
How do I upgrade my free website?
  1. Go to My Account and then to Websites & Digital.
  2. Locate the card of the site that you want to upgrade.
  3. Click on the three dots ••• in the top right corner and click Upgrade.
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  4. Select the desired plan by clicking Choose Plan.
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  5. Choose a billing cycle, then click Continue.
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  6. This adds the new plan to the shopping cart, click checkout, then fill in your billing details. Image

You have now upgraded your plan and can start using your premium features immediately!