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It is my first time to try a 3D program, and I really need some help. I tried to generate some simple posing using Makehuman and Blender together. I managed to load the MHX file into the Blender. Then I clicked the model in the properties to enter the pose mode. However, I could not select the circles to generate the pose I would like to have.

Any idea about what I did wrong?

Thank you in advance.

Best.

Ming

PS: Center of model is always fixed at the foot for me, is there a way to change it?

This is more a general Blender usage question than related to MH, but in pose mode you should be able to right click bones to select them, and move them using grab 'g' or rotate 'r'.
I think you best start with basic introductions to blender, using for example the beginner guide, or video tutorials.
http://en.wikibooks.org/wiki/Blender_3D:_Noob_to_Pro