After installing, follow these steps to apply the RT Adjustment Layer plugin in the Final Cut Pro X Timeline:
Locate the RT Adjustment Layer plugin in the Custom category of the Titles Browser.
Drag the adjustment layer into the Timeline above the clips you want to apply effects or transformation to. The adjustment layer will appear like a title across your clips.
To apply an effect to all the clips below the adjustment layer, drag any effect from the effects browser onto the adjustment layer. Every clip below the adjustment layer will receive the effect (in this example, a Comic Look Effect is being applied). The effect parameters can be changed in the Inspector.
To apply 2D transformations to all the clips below the adjustment layer, select the adjustment layer, then enable transforms using the menu on the Toolbar or in the Inspector. Any rotation, scale, crop or position properties will be applied to all clips.