I'm having problem with the FB app I created. When I go to the Community page (created by clicking the button Create Facebook Page) I can't find the "Add to my page" link. I can't put the app that I created to my fanpage.
Yes, it is true. You can no longer add tabs using that link. Besides that, facebook will remove all application profile pages on february 1st 2012. What can you do in order to add your tab is to access the following url:
https://www.facebook.com/dialog/pagetab?app_id=YOUR_APP_ID
&display=popup&next=YOUR_URL
(make sure you replace with your app id and the url). You will see there a drop down list with the pages you are administrator of. Choose the page you want and click the „add page tab” button. That's it.
More info on this you can find here.