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I would like to apologize, but please be noted that JotForm doesn't support Password Protection for forms. However, there is an alternative way of doing this, in which you will be having the same result you need.
With the use of our Condition Wizard, you will be able to ask your user first for a "Code" before users can fill up your form.
The first thing that you will do is create your form and place it under a Form Collapse tool. Kindly do this with the Submit button separately.
The reason why we need to put the form inside a Form Collapse so that it will be easy for us when we make Condition statements. There is no need for us to make conditions for every field in the form. It will be a lot of work, especially, if you have several fields on your form.
Set the both Form Collapse to "Hidden" so the Form Collapse itself would not show on the form. Then Set its Status to "Open" so that it is always open and there's no need for it to be clicked as it is "Hidden".
The next thing that we will do is create a field to where users would, likely, put in their "Code" required to open the Form. Then, we will create a condition for that.
Add another condition for your Show Submit Button Form Collapse and make sure it has the same "Code".
As you will notice, I have used the label "Code" instead of "Password" because we have an automated Anti-Phishing system that scans all forms and tag it if there is a probability of phishing activities. You may also use labels like Key, Authorization Code, Access code or any of the like.
I hope this answers your question. If there's anything else that we can be of assistance, please feel free to let us know.
Thank you so much.