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Are you talking about setting the initial position? You can set this by modifying your .world file. Example:

roomba( pose [ 3.2 8 0 0 ] name "roomba_0" color "red")

where roomba is the name of the model of my robot. The first argument of pose is the x position, the second is y position, third z position and the last is the orientation of the robot.

Another way to set the robot's position is to click on it and drag to the desired position.