我有以下页面：
https://www.facebook.com/LetsMapp
我想添加“转到应用程序按钮”，就像这个页面有：
https://www.facebook.com/iframesapp
我该怎么做呢？
我目前的设置：
Basic Info
Display Name: LetsMapp
Namespace: letsmapp
Contact Email: mb@conchain.com
App Domains: letsmapp.com
Category: Communication
Hosting URL: You have not generated a URL through one of our partners (Get one)
Sandbox Mode: Disabled
Select how your app integrates with Facebook
Website with Facebook Login
Site URL: http://letsmapp.com/
App on Facebook
Canvas Page: http://apps.facebook.com/letsmapp
Canvas URL: http://letsmapp.com/canvas/
Secure Canvas URL: https://letsmapp.com/canvas/
Bookmark URL:
Canvas Width: Fixed (760px)
Canvas Height: Fluid
Native iOS App
iOS Bundle ID: conchain
iPhone App Store ID: 483192608
iPad App Store ID: 0
Configured for iOS SSO: Enabled
iOS Native Deep Linking: Enabled
URL Scheme Suffix:
Page Tab
Page Tab Name: LetsMapp
Page Tab URL: http://letsmapp.com/canvas/
Secure Page Tab URL: https://letsmapp.com/canvas/
Page Tab Edit URL: