Adding a code field

What kind of code field you want to add? 

If you are planning to add a "Password" field in the form, then I would advise you not to. The reason is that you are not allowed to collect login credentials here in JotForm. It violates our terms of use.

If you are trying to add a coupon code field, please refer to this guide: How-To-Add-Coupon-Code-in-the-Payment-Form

If this is not what you need then please get back to us and provide more details about your problem. Thank you.