Is this already made a tutorial for? I don't know. And excuse my english, I'm blame my age (14) and nationality (Norwegian).
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1. Open SketchUp
2. Delete the woman ;P
3. Go to Window, preferences
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5. Go to Extensions
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6. Check Sandbox Tools
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7. Click OK
8. Go to View, toolbars, sandbox
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9. Click on From Scratch
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10. Make a square with it (Drag first a line and then one more. Two clicks)
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11. Go into it's group (Double-click on it)
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12. Click on Smoove
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13. Raise and depress :)
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That's how easy it is :)
Peace and love 8)