1
Open the Windows Store. Facebook Messenger is available for free from the Windows Store.
2
Search for "Facebook Messenger". Select it from the list of results.
3
Tap the "install" button. Wait for the app to download.
4
Start Facebook Messenger. You can find the tile on your phone's Start screen.
5
Login with your Facebook account. After logging in for the first time, you'll be asked to set your notification preferences.
- If you already have the Facebook app, Messenger will usually retrieve your login details so you don't have to enter your email and password again.
6
Start using Facebook Messenger. Once you are logged in, you will be shown all of your Facebook conversations. You can use the app to chat with any of your Facebook friends
Resource by : Wikihow
You can install in Google Play