You must use the Model-Editor to add the first Mechanism-Editor - see Add Mechanism-Editor
You can add many Mechanism-Editors. You must have one.
Menus and Toolbars:
•Model elements - to add Planes and add Mechanism-Editors to Planes.
•Kinematic elements - add basic functional parts as complex kinematic-pairs
•Machine elements - add more complex functional parts
•Kinematic Function-Blocks - to synchronize and measure the motion of each kinematic-chain
•Modeling Function-Blocks - tools to help you build your machine (above the name-tabs)
•Force elements - to measure force, torque and power required to drive the each kinematic-chain.
•Solid elements - to show the kinematic elements as solid model elements (above the name-tabs)