Its been awhile since I set my Poser 6 to save as transparent png.  I have friends however that are new to Poser and have asked me how to do this. I cannot remember as its been over a year.

Now even though they are saving as .png they are still getting a gray background. I know its simple but for the life of me cannot remember how to do it.

Anyone?

Edited to add: this is for saving a render.