The only entities that can handle ActionManager are the scene and the meshes in the scene. Each Babylon.js mesh has its own action manager reference. To enable actions on a mesh, just create a new reference to the mesh, as follows:

myMesh.actionManager = new BABYLON.ActionManager(scene);

The ActionManager constructor takes only the scene as a parameter.

Let's create your first action in a scene composed of a box and a plane. The action must change the box's position on the y axis from 0 to 6 when the user left-clicks on the box. The only thing to do is to call the .registerAction function on ActionManager of the box, as shown in the following:

myMesh.actionManager = new BABYLON.ActionManager(scene);
myMesh.actionManager.registerAction...