Instructions
Turn on your PlayStation 3 and sign in to your PlayStation Network account.
Navigate to the ̶0;Friends̶1; category on the far right side of the XrossMediaBar.
Highlight ̶0;Players Met̶1; and press ̶0;X̶1; to display the last 50 people you have played online with and select the person you want to friend.
Type a message using the onscreen keyboard, then select ̶0;Send.̶1; If the person you want to friend is not listed in the Players Met category, proceed to Step 5.
Select the ̶0;Add a Friend̶1; option above Players Met. Select the ̶0;To̶1; field box and use the onscreen keyboard to type the player̵7;s PlayStation Network ID.
Enter a message for the person you are sending the friend request to and then select ̶0;Send." After that person accepts your invitation, that person appears in your Friends list.