“I accidentally blocked a friend from my Yahoo Messenger (from Yahoo Mail), how do I unblock them?”
1. Log into your Yahoo account.
2. Go to the upper right corner and click on the gear icon.
3. Select Messenger Options from the drop-down menu.
4. In the Block User section, make sure the ‘Block users in the Block List below’ is selected. Click on the user you want to unblock from Yahoo Messenger. Now with the username selected, click on ‘Remove’.
The user show now disappear from your unwanted list. Happy messaging!