2D Hinge Joint

Hello.
i want to make a thing like that in the video
4:05 and i follow the instructions in the video but every thing missed up so how can i do it?

 

Any one know how to do it?

 

http://unity3d.com/pt/learn/tutorials/modules/beginner/2d/hingejoint2d
watch the video, but keep a paper and a pen close to you! make notes and test your theories and practice to get the result you want.

 

Thank You