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JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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If I understand you correctly, you would like to set a restriction on the accessibility of the forms, is that correct?
You can use conditional logic to hide or show the form depending on the user input. Here's a guide to learn more about conditions: http://www.jotform.com/help/57-Smart-Forms-Using-Conditional-Logic
Here's a sample form: https://form.jotform.com/53154963102955?. Type in the "Access Code" "1234" to show the content of my form including the submit button. I'm using the form collapse bar in this case. Here's a guide about the form collapse: http://www.jotform.com/help/297-Show-or-Hide-multiple-fields-at-once-using-form-collapse-tool
Here's how I setup my form:
1. First, I use a text box for the access code.
2. I then use a form collapse bar to wrap the rest of the content of the form.
3. I will then use the conditional logic to show/hide the form collapse bar based on the access code input.