1. Go to https://developers.facebook.com/
2. Now click on the apps button at the top.
3. Now click on the create new app button located near top right corner.
4. Now enter your desired device name in the box provided for App Name.
5. For App Namespace enter any word or leave it blank.
6. Choose app category as others and leave web hosting option unchecked and click continue button.
7. Now, copy the app id and paste it in place of your app id in below mentioned link and then, place this link in the address bar of your browser and hit enter.