How Can I Block Someone On Messenger
Camila Farah

Tap block and then change the block messages toggle to on.
There are two ways in which you can block someone on facebook messenger. Just scroll down the page until you find the block option. Open the chat with the person you want to block and tap on their name at the top of the screen. Tap on block on messenger option.
Open facebook messenger and search for a conversation with the person who you would like to block. Scroll down to the bottom and select block. To unblock them just flip the block messages toggle back to off. You will see two options on the page.
For now we will choose the block on messenger option. You can block them on messenger as well as on facebook. Open a conversation with the person you want to block and click. On the facebook messenger app.
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Click on their profile icon picture or name displayed at the top of the screen to display a list of settings.Source : pinterest.com