There are a few ways to reference a PlayMakerFsm in your scripts:
1. Add a public PlayMakerFSM variable and link to the component.
A simple example:
2. Use GetComponent to get an PlayMakerFSM Component on a GameObject.
Javascript example:
var LivesFSM : PlayMakerFSM;
//assign the FSM on the Lives obj
LivesFSM = gameObject.FindWithTag("Lives").GetComponent.<PlayMakerFSM>();
var LivesRemaining : int;
LivesRemaining= LivesFSM.FsmVariables.GetFsmInt("Remaining_Lives").Value;
Another Javascript example:
3. Use GetComponents and the FsmName property to find a specific FSM on a GameObject that has multiple FSMs
Get all PlayMakerFSM components on a GameObject using GetComponents<PlayMakerFSM>(), then loop through them and find the one with the right FsmName.