How can I change the access code to my keyless garage door opener?

I just moved into a house that has a Craftsman keyless garage door opener but I want to change the code. The previous owner didn’t leave the manual and I can’t find instruccions anywhere. How can I change the code?
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Or better yet, go to the Sears web site and ask for a manual. You should be able to download one.
Try to find an options/maintenances button. It might be a button hidden inside a hole on the side or back of the key pad. Probably easier to call and ask the manufacturer of your particular device directly.