How do you unblock someone from messenger?

You can unblock messages from someone in your settings:**Tap Settings > People.**Tap Blocked.**Tap the name of the person you want to unblock.**Tap next to Blocked Messages to unblock that person. read more

If you have the messenger app, thats the easiest way.. 1. Type the person's name in the search, and you should be able to click the person's name as if you were trying to start a conversation/chat window. 2. Once you click the name, and the message window opens, click the person's name at the top (where the phone icon is). 3. read more

In this section, it'll allow you to unblock them from two areas: Facebook itself, or just Messenger. It should be self explanatory from this point on, pretty much. To the right of the thing you want to unblock them from, click the toggle/slider switch. read more