It probably means you have a rolling code garage door; this is good because a crafty burglar can't sniff your opener and play it back to gain access.
If you move on to the next page, there are instructions for that as well. It requires a second person to push the training button on the opener at the same time.
If you move on to the next page, there are instructions for that as well. It requires a second person to push the training button on the opener at the same time.