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


5. Go to Extensions


6. Check Sandbox Tools


7. Click OK

8. Go to View, toolbars, sandbox



9. Click on From Scratch


10. Make a square with it (Drag first a line and then one more. Two clicks)


11. Go into it's group (Double-click on it)


12. Click on Smoove


13. Raise and depress :)

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That's how easy it is :)
Peace and love 8)