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I do strongly suggest checking out this guide on encrypted forms: What are Encrypted Forms and how to use them as expert? - even more if you are not familiar with encrypted forms and how they work.
The same will also show you how to create your private key, but based on what you have mentioned it could be that your browser has some issues processing the same.
Could you please try to open the form in FireFox browser instead?
You can get it here: https://www.mozilla.org/en-US/firefox/new/
Once you do, please do try it out and let us know how it goes for you and if you are still having any issues. Since your original query was cut off, we do not have all the details that you have posted, so if you are still having the same issue even with the FireFox, do include as much details as possible.
Once I opened up in Chrome it went right through