First access link http://developers.facebook.com/:
Then Login with your user and password. After login you'll be redirected to the follow page:
Then click in the button "Register as a Developer".
You'll be redirected to these follows pages:
After register click in "Create New App"
and then write the name "Facebook Collector" in App Name, and click in Continue
write the Security Check and click in Continue
You create you App.
Now you have only to click in "WebSite with app integrates with Facebook" and write the follow URL:
Make sure the iten Sandbox Mode is Disabled.
And click in the botton Save.
Obs: When you do the first login in the system, you'll asked to give the permissions to this APP the you created bellow. Click in "Go to App".
Press Here to go back to Register page.