Old Overhead Door Opener Model 551?

We just got in our new house and are trying to program a Clicker Universal Keypad to our garage. I have an older Overhead door Model 551. The Clicker Manual says its campatable with models from 93 and to present. Our house was built in 94. We have no manuals. We need to figure out were the Smart/Learn Button is on the back or if it will even work. We have wasted hours doing this and only found three buttons SW1 SW2 SW? Please help. The last time this was posted it was resolved but the link to resolve the issue was not helpful to me. I am curious what to do. Thanks.