How do I actually use Private Key to view my data?

I created an encrypted form and the private key that goes with it? 

Thank you for contacting us.

When you access the Submissions page of encrypted form, you should be asked for a Private Key. Usually you need to upload it only once, and it will be automatically saved in your browser local storage.

Then, you will see decrypted data.

Note, that you still need to keep the Private Key file in a secure place. The submission data (encrypted) is gone if you lose the key file.

If you need any further assistance on this, please let us know.

How do I obtain that private key?

You should be able to get a private key when you first use or open the Encrypted Forms feature.

Here are the guide links to learn more about this feature:

http://www.jotform.com/help/344-What-are-Encrypted-Forms-and-how-to-use-them-as-expert 

http://www.jotform.com/blog/162-Introducing-Encrypted-Forms-The-Ultimate-in-Online-Form-Security 

Please do make sure to check the Frequently Asked Questions on the guide links I shared.

If you need more information on this, please do let us know.