First, go back and dial #620 to undo the #621 that you did. It looks as though you have a CTX/CIX and not a DK. On the DK model, #621 is the feature code to change the display name on the phones. On the CTX/CIX, #621 disables system call forward. If you have Winadmin/Emanager, use that to change the names. You might be able to change the names via a DKT set depending on your software level and are given that ability in programming. If you are at a complete loss as to what I'm talking about, you may want to have a vendor do it for you and maybe have them set it up to where you can do it yourself.