Things You'll Need
Instructions
Removing a Friend
Turn on your PS3 if it's not on already, and navigate to the Friends section of the XrossMediaBar (XMB) menu.
Locate the user you want to remove from your Friends list.
Press the green triangle button, and select "Delete."
Blocking Someone
Turn on your PS3 if it's not on already, and navigate to the Friends section of the XMB menu.
Select "Message Box," and then select "Received" to display the messages you've received.
Navigate to a message from the user you want to block, and press the green triangle button.
Select "Add to Block List."