Extender password unaccepted

Thanks Darren. I finally got it going by doing what the idiot sheet told me to in first place but hadn't read it properly!! Plugged it in right next to the modem (which is in building next door) and it connected automatically. My problem was being the second extender on the system the first had .ext and mine was .EXT but when I first tried it away from the modem it came up .ext.EXT so wasn't recognised. Anyway all Good now. Thanks and Merry Christmas!!!