This model is in OBJ format only so it won't show up in your Poser Library by default, it would need to be saved back into the Library as a prop. You have 2 options on importing the model and its parts, either 100% scale of original size or 100% of standard figure. The scaling can be changed considering that, as HartyBart mentions, the model is exceptionally large. You will need to adjust the scaling accordingly to import it in the Poser scene and then rescale to the size you desire.