How can you program a Liftmaster garage door opener when there is no "B" button?
I just installed a new Chamberlain opener. The only difference between Chamberlain, LiftMaster and Crafstman brands are the color and the name printed on them. (i.e., they're all made by Chamberlain.) Having a program/learn button on the wall-mounted, wired remote was a novelty for me, as neither of my previous 2 openers had that.
As jay613 noted in his comment, mine also has programming/adjustment buttons under one of the light covers on the motor, just like both of my old ones did. I'm quite certain that yours will, as well, and you can use those buttons just like you would use the buttons on the wall-mount remote.
Once you figure out how to get the first remote programmed, (check out their website for your model, or, if necessary, hit up their online chat - they're quite helpful - they'll even wait while you run from the computer to the garage to try their instructions), programming additional remotes is exactly the same process. You can program wall-mounted, battery-powered numeric keypad remotes (you know, mount it outside the garage door, enter a code, garage door opens); visor mounted 1-, 2- or 3-button remotes; you can even program it to respond to the HomeLink buttons (usually) on the sun visor of your car (if it's so equipped). I'm sure there's an upper limit to how many remotes it will respond to, but I'm at 5 and haven't hit it.