How can I encrypt my existing forms?

I tried following the directions from this blog post, but I cannot seem to access the "Preferences" or "Advanced Settings"

https://www.jotform.com/blog/encrypted-forms/

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Please click the "Show more" button to see the form encryption setting/option.

To know more about form encryption, please refer to this guide: Encrypted-Forms-and-How-to-Use-Them