Hi Bette,
Welcome back to machine knitting. Sorry to hear you are having problems.
To start with make sure that the Holding Cam Lever is set to N and none of the Cam Buttons are pushed in - if they are use the Cam Button Release Lever to cancel them and make sure it is set to Plain. With the carriage set this way all needles should knit.
Now pull forward every other needle between 30 Left to 30 Right of centre 0, thread the yarn into feeder A and close the lever and take the carriage across; you should now have a loop of yarn on each of these needles. Hang on the cast-on comb, pull forward the in-between needles and take the carriage back. You should now have a cast on suitable for knitting a practice piece.
I hope this helps get you started.
Regards,
Sue, November 2011