Removing a Block
You can remove Buddies from the Block group at any time to allow them to see when you are online or send you messages.
To remove a Buddy from the Block group, perform the following steps:
Select Edit on the Buddy List window.
The Edit Lists window appears on your screen.
Click your Buddy's Screen Name in the Block group.
Allowing Everyone to Contact You
Allowing Specific Buddies to Contact You