There are Three (3) Facebook Modules: Facebook Page (this document); Facebook Posts and Facebook Photos. Each of these have different requirements. Additionally, you may choose to populate your app using the Facebook Page information (see the App Details Article), which would automatically configure your app with the information found on the Facebook Page.
Facebook Page Module
Enter your FP Page ID or Page Name NOT full URL, and NOT the username.
If the URL is www.facebook.com/pages/Cafe- Gratitude/54188889030
If the URL is www.facebook.com/pages/sam-smiths-page
enter sam-smiths-page as the page name. Either will work.
You may also choose to open in a child browser or an external browser. In iOS apps, this won’t matter as they open all URLs in an external link in the Safari browser, however, in Android apps, if you chose the child browser app, it will open within the app.