What is the private key wizard?

I am getting bots filling out my submission forms. How do I prevent that? I am asked to provide a privacy key as though it's a file that I can upload but I have no idea what that is referring to. 

The private key wizard allows for uploading your encryption key file when using encrypted forms:

https://www.jotform.com/help/344-Encrypted-Forms-and-How-to-Use-Them

As for preventing bots from submitting the form, the best way to do so is to add a captcha to the form:

https://www.jotform.com/help/205-How-to-Add-a-Captcha-Field