You can create an Agent Group by using the shelf button or via the Atoms Menu: Atoms > Create Agent Group.

Multiple agent groups can be created simultaneously via the Atoms menu: Atoms > Create Agent Groups.

Setting up the agent group

Please make sure the attribute editor is visible and select the agent group node.

Click on the "Add" button and add a gridLayout module. Type the agent type name you entered previously in the "agentType" field (i.e. testMan).
Set the "size" field to (3,0,3).

Then do one of the followings:

Click again on the "Add" button and add a stateMachine module.
Click again on the "Add" button and add a clipReader module. Type the animation clip name you entered previously in the "clipName" field (i.e. newManWalk). Set the startFrame value to 0.

Hit the play button to run the simulation.

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