how to upload form to facebook page

Hello jia12345,

You may like to check the following guide which should help you embed form in your FaceBook page:  http://www.jotform.com/help/22-Adding-Form-to-Facebook-Pages 

You may also like to check the following guide as well for custom iFrame app method:  http://www.jotform.com/help/82-Adding-Form-to-Facebook-Custom-iFrame-App- 

Hope this helps.

Do get back to us if you have any questions.

Thank you!