I am unable to add my form to facebook, its showing the page donent hav

I am unable to add my form to facebook, its showing the page donent have permission , kindly guide me

Only pages with more than 2,000 followers can add custom tabs. Please take note that this is a change implemented by Facebook and not by JotForm. 

You can also try this workaround, follow the guide below to add the form to your page if you do not meet their requirement: 

https://www.jotform.com/help/82-adding-a-form-to-facebook-custom-iframe-app/ 

I hope this helps.