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If you are using the "Add JotForm Tab" in your Facebook page, unfortunately, I believe it only allows 1 form or tab on a page.
You could try this guide to add another one: http://www.jotform.com/help/82-Adding-Form-to-Facebook-Custom-iFrame-App-. I'm not sure if that app allows multiple tabs though.
Let us know if you need more information on this.