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You must be looking for a way to masked the text with asterisk (*) similar to that of a password.
You can achieve this using custom CSS code.
Review the solution provided by our colleague Charlie on this thread
Here is the demo jotform http://form.jotformpro.com/form/50564426412955?
Let us know if you need further assistance.
I have moved your concern to a new thread. We believe that we can better assist our users if they will have a thread of their own for every question they have.
Here's the link to the thread I have created for your concern.