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Thread on which you posted your question is 4 years old and issue from that thread is resolved.
Can you please provide us more details about your issue?
Inside of this guide you can find how to add your form to Facebook:
Looking forward to your reply.
Dear Jotform Support Team
When I follow the steps as provided in the link for adding a form to FB pages, the ADD JOTFORM TAB button does nothing. The window to login to my FB page does not come up.
Please advise, as I think I would prefer this FB option to the Fit Form option as I need to collect registrations through FB and an online Reg Form.
I look forward to hearing from you.
I moved your request to this new thread : http://www.jotform.com/answers/740934
We will assist you there.