Hold down the button on your remote and then press and immediately release the smart/learn button on the back of your motor unit. Do this for each remote. If your remotes quit when you programmed your new keypad you probably got the wrong one.
If your remotes work o.k. after programming and your keypad has quit it is certain you got the wrong one.

Ok, I programmed the remotes like you suggested and now my keypad doesn't work. Does this mean I have the wrong keypad? How do I know which keypad to buy? Thanks.

Yes you got the wrong keypad. Take the model number off the motor unit to Sears. The model number starts with 139. and has at least 5 additional numbers.

Ok,thanks. When I bought the keypad I thought it said it was good for the complete series which my opener falls under. I'll check it out.

i have the exact same problem and just posted it, I know i have the right keypad because it used to work. The remotes stopped working so I reprogrammed and I can get each to work independently but not together