How to create a password protected form?

Youform doesn't support the password protection feature yet, but this is in the pipeline and will be shipped soon. You can  upvote it here .
For now, the easiest way is to go to your Youform dashboard, click on the New Form button, and search for the template  Password Protected Form  to use that template. If you have an existing form, you can just check how that password-protected form is created using the logic builder by going to the logic builder of that form. It will be very easy to implement. 
Go to your Youform dashboard and click New Form.
Search for and select the  Password Protected Form  template.
If you already have an existing form, open its Logic Builder to see how the password protection is set up — it's straightforward to replicate.
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Password protected form
https://app.youform.com/forms/eympt4e9
Password protected formPassword protected form