How do I add a password to my form?

We don't allow asking for Password in any form. We also have anti-phishing filter tool that will automatically suspend your account if it detects any phishing field such as password, credit card or login information. Please read our terms of use to avoid getting your account in risk to get suspended. 

If you have questions, please contact us again. Thank you.

I mean setting up a password on my form in order that only users with the password are able to complete the form.

Unfortunately, there's no exemption. You will still get suspended by using the word "Password". However, you can use other words like "Random word" or "Use the word given to you by the company". 

I have created a demo form asking for a random word and it will show the fields if the random word is correct. Here's the demo form link: https://form.jotformpro.com/70722979974979

The Random word is jaque123.

Here's the guide how to hide or show multiple fields with condition: https://www.jotform.com/help/196-Hide-or-Show-Multiple-Fields-at-Once

If you need further assistance or have questions, please contact us again. Thank you.

Thanks for that! But there is o a setting itself to do this? Can I suggest the feauture

A specific or standalone feature, nothing. The conditional logic is our current feature that would allow you to password protect a form. I think the output is the same, if ever we have this feature. You may consider adopting the conditional logic method, it should work.