Hi there!
I don't know if I understand. But to use the plugin you need to build the following:
1 - On Plugin Parameters > New Parameters: Here you will create the custom parameters for your game.
2 - Plugin Parameters > Templates: Here you will build the custom parameters configurations to be applied to the data objects: Weapons, Armors, Classes, Actors, etc.
3 - Get the template name created on 2 and assign it to a note tag on the data object of your choice:
4 - Alternatively, you can skip steps 2 and 3 and just insert the plugin parameter note tag:
So that are two ways of setting custom parameters to an actor.
Now to use them in-game, it all depends on you. You can reference them in damage formulas by using their short name or script calls etc.
If you want to change parameters, inside the game, you can use the plugin commands/ script calls that are on the help file. Did you not find them?
Show me the event you are using to change the custom parameters.