Adjusting polys of purchased model. Locked?

Hi,

I apologize for the newbie question, but I've recently purchased a high poly model that I thought i would be able to easily adjust.

I must be overlooking something and am hoping someone can help.

I expected if i used polygon mode and live selection that i could rotate/move the polys (arms/legs) of this model. Upon trying, the entire model rotates and not the selected polys.

Hope you can help.
thanks!