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Try going to System Prefs > Mouse and see if you can activate it in that
Or you could try holding down the CTRL key and then clicking with the normal (mouse) button.. that should emulate a right click.
Which Macbook, thats too technical for me!
I don't think I have a mouse button unless you mean the long bar at the bottom of the pad? Will try the Systems pref route and see what happens. If all else fails I might buy a little plug in mouse.
Do you have the Apple symbol at the top left of the screen? If you click on that it should bring up "About this Mac" which will tell you make, model, etc. At least it does on my older desktop.