Hello guys

I need your help.
I had a 3d human  figure on 3d studio max.
I exported it as a wavefront object
Then i imported it on poser.
The problem is that in poser i see it as a united figure with no separetely parts
I need to bend his arm or his leg for example.
How can i do that?
When i click on the figure i can see something like a skeleton in it and i know that it has to do something about what i want to do i just don t know how.

Can you help me?
Thanks