I have a 1/2 hp Sears Craftsman garage door opener dated 7/96 Canada I reprogrammed the remotes but I cannot reprogram the key pad. I push the square button and have someone punch in four numbers and hold the last number until the light goes off About 25 seconds but there is no change What am I doing wrong?

You shouldn't need to reprogram the pad; it functions as before simply sending a signal to the opener that has the programing saved in it.

push the green button on the opener then push your remote button

You are probably not reprogramming the remote or keypad, but are using the remote to reprogram the receiver. But I can't get the instructions from the Chamberlain site without a model number. Here is their site:
http://help.chamberlain.com/help/en-us/programmingInstructions/

Hi,
Click below to get to the manual you need. Just scroll through till you get to your model number.

http://www.managemyhome.com/mmh/owner_manuals/search?query=GARAGE+DOOR+OPENERS&find=

Hope This Helps,
RSMITH972278
P.S. PLEASE RATE ME

you may have to reprogram the remote. it's easy push the square red or blue button on the door opener and within 30 sec push the 4digit number on your remote and push enter. the light should blink twice to tell you it took the new connection.

Mulleta,

If you look on the back or side of the garage door opener you will see a small square red/orange button.
Push the button one time, and you will see an amber LED come on. Go to your keypad enter a four digit (of your choice) then press and hold the the enter button until the garage door opener light flashes and you hear a clicking sound. You can release the enter button and it will be reprogramed.

This should help.

http://www.garagedooropeners.us/helpgifs/maincode.html

pushed it too long. push 1 second and recode keypad. you wiped out codes by hitting for 6 seconds or more

The light indicator comes on but it never connects with the remote control & I have to reprogram the key pad when, I follow the directions on the unit.

Have you tried to reprogram the chanel again?
Changed the battery?