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You can encrypt your form by:
It seems that this is the first time that you will make your form encrypted and you have not downloaded your encryption key before. I would suggest you select the "Create encryption key for me" option and download the key to your computer. Please keep that key for you will be using that to decrypt submission data on your account.
Here's a guide that you can also use:
If you have any further questions, please feel free to let us know and we will be glad to help you. Thank you.