1. Follow this guide to configure you Meta app.
2. For Android:

Add your App ID for Android.
Add your Facebook Client Token

You can find Facebook Client Token here:

On Facebook Developer: choose your application → Settings → Advanced → Client Token

Add a meta-data elements to the application element in your AndroidManifest.xml file:

<application ...>
    ...
    <meta-data
        android:name="com.facebook.sdk.ApplicationId"
        android:value="fbYOUR_FACEBOOK_APP_ID"/>
    <meta-data
    	android:name="com.facebook.sdk.ClientToken"
    	android:value="YOUR_FACEBOOK_TOKEN" />
    ...
</application>

Configure the Info.plist file with an XML snippet that contains data about your app.

1. Right-click Info.plist, and choose Open As ▸ Source Code.
2. Copy and paste the following XML snippet into the body of your file ( <dict>...</dict>).

<key>CFBundleURLTypes</key>
<array>
  <dict>
  <key>CFBundleURLSchemes</key>
  <array>
    <string>fbAPP-ID</string>
  </array>
  </dict>
</array>
<key>FacebookAppID</key>
<string>APP-ID</string>
<key>FacebookClientToken</key>
<string>CLIENT-TOKEN</string>
<key>FacebookDisplayName</key>
<string>APP-NAME</string>

In <array><string> in the key [CFBundleURLSchemes], replace APP-ID with your App ID.

In <string> in the key FacebookAppID, replace APP-ID with your App ID.

In <string> in the key FacebookClientToken, replace CLIENT-TOKEN with the value found under Settings > Advanced > Client Token in your App Dashboard.

In <string> in the key FacebookDisplayName, replace APP-NAME with the name of your app.