Secret Codeword for Signup
Installation and Configuration
You could set the signup to pending so that admin has to approve all new signups by clicking the approve button. That system already exists.
How are you stuc at user_codeword. You should be able to save that then select how the form shows. Show it as a 'text' field and they can enter text.
There are docs on its use here:
"Using the Form Designer"
https://www.jamroom.net/the-jamroom-network/documentation/getting-started/1275/using-the-form-designer
and a walkthrough here:
"HowTo use the Form Designer......"
https://www.jamroom.net/the-jamroom-network/documentation/howto/2463/howto-form-designer-aparna-custom-page-module-with-rss-feed