If you're looking to link directly to Facebook Messenger, there are a few different ways you can do it. The first is by downloading the official Messenger app from the App Store or Google Play Store. Once you have the app installed, you can create a shortcut to messenger on your home screen.
The second way to link directly to Messenger is through Facebook's website. If you go to messenger.com, you'll be able to log in with your Facebook credentials and start chatting with your friends.
And finally, the third way to link directly to Messenger is by using a service like Chatfuel or Manychat. These platforms allow you to create chatbots that can interact with users on Messenger. You can use these chatbots to answer common questions, provide customer support, or even sell products and services.