How to create an LTspice model for 1N4733A Zener Diode?
First, your diode should be reversed, since it's a Zener. Then you have to rename it to reflect the model that you just pasted in the schematic: rename D to D1N4733 (that is the name that follows .subckt). And last, if all you need is to use the diode then there's no need to worry about the parameters -- they're simply passed to the intrinsic model of the diode in order to behave like a real one, or at least as well as the model is. So, you can ignore them, unless you want to know the details, in which case you should be searching for tutorials for SPICE.