Is it possible to secure the form with a password so that only the person who has the password can fill in the form?

Second question, is it possible to secure the form with a password so that only the person who has the password can fill in the form?  

Please note that authentication form can't be used in JotForm. It is not possible to authenticate users form any external source or previous submission data. 

You can add a textbox in your form and then take advantage of our "Conditions" feature to show / hide entire form if the value of the textbox does not match with predefined texts. Here are the steps your should follow:

1. Add a "Form Collapse" field at the start and end of your form. You can set the "Section Visibility" of the form collapse as "Visible" and the "Button Visibility" as "Hidden". 

2. Before the first form collapse, add a "Text Box" field where user can input the password. Please be noted that you should not use "Password" label in your form. You can use any other text like "Code", "key", "authorization". We have automated anti-phishing system which scans all forms and mark them with probability of being used for phishing activities.

3. You can add condition in your form to check the input text of the text box. If the password matches, you can show the entire form collapse field which will in turn display all the form fields. Please check the screenshot below:

Please take a look at the following demo form :  https://form.jotformpro.com/71345547677972 

Feel free to clone this form for a closer look. The following guide should help you in form cloning:  https://www.jotform.com/help/42-How-to-Clone-an-Existing-Form-from-a-URL  

Hope this helps.

Do get back to us if you have any questions.