Move Rotate Zoom Scale
Move
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An atom
 
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Drag it with the mouse in Selection mode     
    
    
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A selection
 
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Press Space-bar once or move the mouse pointer toward the center until a blue rectangle appears and drag
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Click the center of the object and drag.
 
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Rotate
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A selection
 
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Press Space-bar twice or move the mouse pointer over the selection until a blue rotation symbol appears and drag.
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Click the center of the object and drag.
 
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A selection in 3D
 
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Select Edit > Transform > Rotate in 3D > ... and drag.
 
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Zoom
Set the magnification of the molecule on the canvas by the Zoom buttons.
If you have a mouse with a wheel, hold down the Ctrl key, and then scroll the wheel to zoom in or out. When a molecule is loaded into the editor, it is scaled automatically to fit the window.
    
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Zoom In:
 
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Click Zoom In      
on the General toolbar and click on it as many time it is necessary  or    
Select a level from the Zoom tool's drop-down list     
(or from the View > Zoom Level menu) or to All. (The All option zooms in or zooms out the objects to the full size of the canvas.)    
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Zoom Out:
 
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Click Zoom Out     
 on the General toolbar and click on it as many time it is necessary orm    
Select a level from the Zoom tool's drop-down list     
(or from the View > Zoom Level menu) and set the magnification to a smaller value..    
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Zoom In/Out:
 
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Press F6 and drag vertically to zoom.
Scroll the mouse wheel over the canvas while pressing the Ctrl key.