How can I use the NUMPAD_PERIOD function to focus on an object when I'm on a Macbook Pro? I already know that you can emulate the number pad through the User Preferences, but that only seems to provide the numbers 0-9. I'm trying to focus on an object by pressing . ,however nothing seems to happen. I've heard about KeyRemap4MacBook, but it isn't available for Sierra.
The only way to emulate the numpad . is to go to blenders * User Preferences > Input*.

Then in the search field type "show active" and remap the function to a key you don't/won't use.