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When you update your form in the form builder, it should automatically reflect on your Facebook page.
However, if you mean you can't get the right form to appear on your Facebook page, please make sure to remove the app first in your Facebook page as I've instructed on the other thread.
After that, go to your my forms page and edit the form you want to put in your Facebook page.
1. 1. Click Publish and then under PLATFORMS, click Facebook.
2. Select Facebook then click the "ADD JOTFORM TAB" button.
3. A Facebook window would appear, follow the onscreen steps to complete the setup.
Here's a full guide: https://www.jotform.com/help/22-Adding-a-form-to-your-Facebook-page