Form is not appearing on Facebook mobile

i was created some forms for my facebook pages, after embedded on my page, they are perfect on PC view,

but i cant see the tab appear while i view from mobile, as u can see i named the tab as Buy Now!.

it is perfect on PC but not viewable on Facebook app on mobile.

this is my page link: https://www.facebook.com/clashibot

On PC, you can see BUY NOW! button left side in the Apps column, but nowhere in mobile.

how do i do so people can access to the form on Mobile Facebook?

i need your help please....

You may consider adding first your form to your Facebook Fan Page if you have NOT done it yet. Use this guide: http://www.jotform.com/help/123-Adding-forms-to-Facebook-Facebook-Developer-Method- 

And probably this problem is related to the Facebook itself. You may check the following thread on Stackoverflow:

Is it possible to show a Facebook app as a Page Tab on mobile devices?

Hope this will help. Let us know if you need further assistance.