Be sure to select the right type of rapidfire macro. Basically there are two kinds, one kind if you want to assign rapidfire to fire when you pull the trigger.
If you want rapidfire/jitter to go when you touch a tac switch, you use a different .VKM for that. They are labeled whether or not it's for 'trigger' or for 'tac switch'.
Also if it says left trigger rapidfire then that means left trigger. You can't assign the left trigger rapidfire one to the right trigger and vice versa. Well, you could, it just probably won't do what you really meant it to do. There are some examples on the macro library download page.